diff --git a/.eslintrc.json b/.eslintrc.json
index b02c43f4..ac117e1a 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -32,6 +32,8 @@
     "prefer-destructuring": ["error", {"object": true, "array": false}],
     "padded-blocks": 0,
     "no-sparse-arrays": 0,
-    "array-bracket-spacing": 0
+    "array-bracket-spacing": 0,
+    "import/no-named-as-default": 0,
+    "implicit-arrow-linebreak": 0
   }
 }
diff --git a/README.md b/README.md
index a698b45b..96845564 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 Learning JavaScript Data Structures and Algorithms
 ====================================
 
-[![Build Status](https://travis-ci.org/loiane/javascript-datastructures-algorithms.svg?branch=third-edition)](https://travis-ci.org/loiane/javascript-datastructures-algorithms)
+[![Build Status](https://travis-ci.org/loiane/javascript-datastructures-algorithms.svg?branch=master)](https://travis-ci.org/loiane/javascript-datastructures-algorithms)
 [![codecov](https://codecov.io/gh/loiane/javascript-datastructures-algorithms/branch/master/graph/badge.svg)](https://codecov.io/gh/loiane/javascript-datastructures-algorithms)
 [![devDependencies Status](https://david-dm.org/loiane/javascript-datastructures-algorithms/dev-status.svg)](https://david-dm.org/loiane/javascript-datastructures-algorithms?type=dev)
 [![dependencies Status](https://david-dm.org/loiane/javascript-datastructures-algorithms/status.svg)](https://david-dm.org/loiane/javascript-datastructures-algorithms)
@@ -61,8 +61,8 @@ Source code of **Learning JavaScript Data Structures and Algorithms** book, thir
 ## Installing and running the book examples With Node
 
 * Install [Node](https://nodejs.org)
-* Open terminal/cmd and change directoty to this project folder: `cd /Users/.../javascript-datastructures-algorithms` (Linux/Max) or `cd C:/.../javascript-datastructures-algorithms`
-* run `npm install` to install all depencies
+* Open terminal/cmd and change directory to this project folder: `cd /Users/.../javascript-datastructures-algorithms` (Linux/Max) or `cd C:/.../javascript-datastructures-algorithms`
+* run `npm install` to install all dependencies
 * To see the examples, run `http-server html` or `npm run serve`. Open your browser `http:\\localhost:8080` to see the book examples
 * Or `cd html/chapter01` and run each javascript file with node: `node 02-Variables`
 
@@ -70,7 +70,7 @@ Source code of **Learning JavaScript Data Structures and Algorithms** book, thir
 
 * Right click on the html file you would like to see the examples, right click and 'Open with Chrome (or any other browser)'
 
-* Or open the `examples/index.html` file to easily nagivate through all examples:
+* Or open the `examples/index.html` file to easily navigate through all examples:
 
 * Demo: [https://javascript-ds-algorithms-book.firebaseapp.com](https://javascript-ds-algorithms-book.firebaseapp.com)
 
@@ -100,6 +100,8 @@ Book link - second edition:
  Book link - third edition:
  - [Packt](https://www.packtpub.com/web-development/learning-javascript-data-structures-and-algorithms-third-edition)
  - [Amazon](http://a.co/cbMlYmJ)
+ - [Chinese version](http://www.ituring.com.cn/book/2653)
+ - [Brazilian Portuguese version](https://novatec.com.br/livros/estruturas-de-dados-algoritmos-em-javascript-2ed/)
 
 ### Found an issue or have a question?
 
diff --git a/examples/chapter10/01-UsingMinHeap.html b/examples/chapter10/01-UsingMinHeap.html
new file mode 100644
index 00000000..83814ba1
--- /dev/null
+++ b/examples/chapter10/01-UsingMinHeap.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+    <title></title>
+</head>
+<body>
+  <script src="./../PacktDataStructuresAlgorithms.min.js"></script>
+  <script src="01-UsingMinHeap.js"></script>
+</body>
+</html>
diff --git a/examples/chapter10/01-UsingMinHeap.js b/examples/chapter10/01-UsingMinHeap.js
new file mode 100644
index 00000000..59b7753b
--- /dev/null
+++ b/examples/chapter10/01-UsingMinHeap.js
@@ -0,0 +1,27 @@
+const { MinHeap } = PacktDataStructuresAlgorithms;
+
+let heap = new MinHeap();
+
+heap.insert(2);
+heap.insert(3);
+heap.insert(4);
+heap.insert(5);
+
+heap.insert(2);
+
+console.log(heap.getAsArray());
+
+console.log('Heap size: ', heap.size()); // 5
+console.log('Heap is empty: ', heap.isEmpty()); // false
+console.log('Heap min value: ', heap.findMinimum()); // 1
+
+heap = new MinHeap();
+for (let i = 1; i < 10; i++) {
+  heap.insert(i);
+}
+
+console.log(heap.getAsArray());
+
+console.log('Extract minimum: ', heap.extract()); // 1
+console.log(heap.getAsArray()); // [2, 4, 3, 8, 5, 6, 7, 9]
+
diff --git a/examples/chapter10/02-UsingMaxHeap.html b/examples/chapter10/02-UsingMaxHeap.html
new file mode 100644
index 00000000..9d573bda
--- /dev/null
+++ b/examples/chapter10/02-UsingMaxHeap.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+    <title></title>
+</head>
+<body>
+  <script src="./../PacktDataStructuresAlgorithms.min.js"></script>
+  <script src="02-UsingMaxHeap.js"></script>
+</body>
+</html>
diff --git a/examples/chapter10/02-UsingMaxHeap.js b/examples/chapter10/02-UsingMaxHeap.js
new file mode 100644
index 00000000..f1a5b97d
--- /dev/null
+++ b/examples/chapter10/02-UsingMaxHeap.js
@@ -0,0 +1,27 @@
+const { MaxHeap } = PacktDataStructuresAlgorithms;
+
+const maxHeap = new MaxHeap();
+
+maxHeap.insert(2);
+maxHeap.insert(3);
+maxHeap.insert(4);
+maxHeap.insert(5);
+
+maxHeap.insert(1);
+
+console.log(maxHeap.getAsArray());
+
+console.log('Heap size: ', maxHeap.size()); // 5
+console.log('Heap is empty: ', maxHeap.isEmpty()); // false
+console.log('Heap min value: ', maxHeap.findMinimum()); // 5
+
+maxHeap.insert(6);
+maxHeap.insert(9);
+maxHeap.insert(10);
+maxHeap.insert(14);
+
+console.log(maxHeap.getAsArray());
+
+console.log('Extract minimum: ', maxHeap.extract());
+console.log(maxHeap.getAsArray());
+
diff --git a/examples/chapter10/03-HeapSort.html b/examples/chapter10/03-HeapSort.html
new file mode 100644
index 00000000..e52c43f4
--- /dev/null
+++ b/examples/chapter10/03-HeapSort.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+    <title></title>
+</head>
+<body>
+  <script src="./../PacktDataStructuresAlgorithms.min.js"></script>
+  <script src="03-HeapSort.js"></script>
+</body>
+</html>
diff --git a/examples/chapter10/03-HeapSort.js b/examples/chapter10/03-HeapSort.js
new file mode 100644
index 00000000..9d9b1ac0
--- /dev/null
+++ b/examples/chapter10/03-HeapSort.js
@@ -0,0 +1,7 @@
+const { heapSort } = PacktDataStructuresAlgorithms;
+
+console.log('********** Heap Sort **********');
+const array = [7, 6, 3, 5, 4, 1, 2];
+
+console.log('Before sorting: ', array);
+console.log('After sorting: ', heapSort(array));
diff --git a/examples/index.html b/examples/index.html
index f0fb0263..7e3e6629 100644
--- a/examples/index.html
+++ b/examples/index.html
@@ -194,15 +194,18 @@
         </div>
       </section>
       <section class="mdl-layout__tab-panel" id="scroll-tab-10">
-          <div class="page-content">
-            <div class="page-content mdl-layout--fixed-drawer">
-              <div class="mdl-layout__drawer is-visible">
-                <nav class="mdl-navigation">
-                </nav>
-              </div>
+        <div class="page-content">
+          <div class="page-content mdl-layout--fixed-drawer">
+            <div class="mdl-layout__drawer is-visible">
+              <nav class="mdl-navigation">
+                <a class="mdl-navigation__link" href="chapter10/01-UsingMinHeap.html">01-UsingMinHeap</a>
+                <a class="mdl-navigation__link" href="chapter10/02-UsingMaxHeap.html">02-UsingMaxHeap</a>
+                <a class="mdl-navigation__link" href="chapter10/03-HeapSort.html">03-HeapSort</a>
+              </nav>
             </div>
           </div>
-        </section>
+        </div>
+      </section>
       <section class="mdl-layout__tab-panel" id="scroll-tab-11">
         <div class="page-content">
           <div class="page-content mdl-layout--fixed-drawer">
diff --git a/package-lock.json b/package-lock.json
index 38e97403..3eefb3e9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,73 +5,77 @@
   "requires": true,
   "dependencies": {
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-      "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-beta.44.tgz",
-      "integrity": "sha512-cuAuTTIQ9RqcFRJ/Y8PvTh+paepNcaGxwQwjIDRWPXmzzyAeCO4KqS9ikMvq0MCbRk6GlYKwfzStrcP3/jSL8g==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+      "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
       "dev": true,
       "requires": {
-        "@babel/highlight": "7.0.0-beta.44"
+        "@babel/highlight": "^7.10.4"
       }
     },
     "@babel/generator": {
-      "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.0.0-beta.44.tgz",
-      "integrity": "sha512-5xVb7hlhjGcdkKpMXgicAVgx8syK5VJz193k0i/0sLP6DzE6lRrU1K3B/rFefgdo9LPGMAOOOAWW4jycj07ShQ==",
+      "version": "7.12.1",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.12.1.tgz",
+      "integrity": "sha512-DB+6rafIdc9o72Yc3/Ph5h+6hUjeOp66pF0naQBgUFFuPqzQwIlPTm3xZR7YNvduIMtkDIj2t21LSQwnbCrXvg==",
       "dev": true,
       "requires": {
-        "@babel/types": "7.0.0-beta.44",
+        "@babel/types": "^7.12.1",
         "jsesc": "^2.5.1",
-        "lodash": "^4.2.0",
-        "source-map": "^0.5.0",
-        "trim-right": "^1.0.1"
+        "source-map": "^0.5.0"
       },
       "dependencies": {
         "jsesc": {
-          "version": "2.5.1",
-          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.1.tgz",
-          "integrity": "sha1-5CGiqOINawgZ3yiQj3glJrlt0f4=",
+          "version": "2.5.2",
+          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.2.tgz",
+          "integrity": "sha512-OYu7XEzjkCQ3C5Ps3QIZsQfNpqoJyZZA99wd9aWd05NCtC5pWOkShK2mkL6HXQR6/Cy2lbNdPlZBpuQHXE63gA==",
           "dev": true
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+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.10.4.tgz",
+      "integrity": "sha512-YdaSyz1n8gY44EmN7x44zBn9zQ1Ry2Y+3GTA+3vH6Mizke1Vw0aWDM66FOYEPw8//qKkmqOckrGgTYa+6sceqQ==",
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-        "@babel/template": "7.0.0-beta.44",
-        "@babel/types": "7.0.0-beta.44"
+        "@babel/helper-get-function-arity": "^7.10.4",
+        "@babel/template": "^7.10.4",
+        "@babel/types": "^7.10.4"
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     "@babel/helper-get-function-arity": {
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+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.10.4.tgz",
+      "integrity": "sha512-EkN3YDB+SRDgiIUnNgcmiD361ti+AVbL3f3Henf6dqqUyr5dMsorno0lJWJuLhDhkI5sYEpgj6y9kB8AOU1I2A==",
       "dev": true,
       "requires": {
-        "@babel/types": "7.0.0-beta.44"
+        "@babel/types": "^7.10.4"
       }
     },
     "@babel/helper-split-export-declaration": {
-      "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0-beta.44.tgz",
-      "integrity": "sha512-aQ7QowtkgKKzPGf0j6u77kBMdUFVBKNHw2p/3HX/POt5/oz8ec5cs0GwlgM8Hz7ui5EwJnzyfRmkNF1Nx1N7aA==",
+      "version": "7.11.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.11.0.tgz",
+      "integrity": "sha512-74Vejvp6mHkGE+m+k5vHY93FX2cAtrw1zXrZXRlG4l410Nm9PxfEiVTn1PjDPV5SnmieiueY4AFg2xqhNFuuZg==",
       "dev": true,
       "requires": {
-        "@babel/types": "7.0.0-beta.44"
+        "@babel/types": "^7.11.0"
       }
     },
+    "@babel/helper-validator-identifier": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
+      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==",
+      "dev": true
+    },
     "@babel/highlight": {
-      "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0-beta.44.tgz",
-      "integrity": "sha512-Il19yJvy7vMFm8AVAh6OZzaFoAd0hbkeMZiX3P5HGD+z7dyI7RzndHB0dg6Urh/VAFfHtpOIzDUSxmY6coyZWQ==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
       "dev": true,
       "requires": {
+        "@babel/helper-validator-identifier": "^7.10.4",
         "chalk": "^2.0.0",
-        "esutils": "^2.0.2",
-        "js-tokens": "^3.0.0"
+        "js-tokens": "^4.0.0"
       },
       "dependencies": {
         "ansi-styles": {
@@ -84,9 +88,9 @@
           }
         },
         "chalk": {
-          "version": "2.4.0",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.0.tgz",
-          "integrity": "sha512-Wr/w0f4o9LuE7K53cD0qmbAMM+2XNLzR29vFn5hqko4sxGlUsyy363NvmyGIyk5tpe9cjTr9SJYbysEyPkRnFw==",
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
           "dev": true,
           "requires": {
             "ansi-styles": "^3.2.1",
@@ -94,10 +98,16 @@
             "supports-color": "^5.3.0"
           }
         },
+        "js-tokens": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
+          "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
+          "dev": true
+        },
         "supports-color": {
-          "version": "5.4.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
-          "integrity": "sha512-zjaXglF5nnWpsq470jSv6P9DwPvgLkuapYmfDm3JWOm0vkNTVF2tI4UrN2r6jH1qM/uc/WtxYY1hYoA2dOKj5w==",
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
           "dev": true,
           "requires": {
             "has-flag": "^3.0.0"
@@ -105,75 +115,65 @@
         }
       }
     },
+    "@babel/parser": {
+      "version": "7.12.3",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.12.3.tgz",
+      "integrity": "sha512-kFsOS0IbsuhO5ojF8Hc8z/8vEIOkylVBrjiZUbLTE3XFe0Qi+uu6HjzQixkFaqr0ZPAMZcBVxEwmsnsLPZ2Xsw==",
+      "dev": true
+    },
     "@babel/template": {
-      "version": "7.0.0-beta.44",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.0.0-beta.44.tgz",
-      "integrity": "sha512-w750Sloq0UNifLx1rUqwfbnC6uSUk0mfwwgGRfdLiaUzfAOiH0tHJE6ILQIUi3KYkjiCDTskoIsnfqZvWLBDng==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.10.4.tgz",
+      "integrity": "sha512-ZCjD27cGJFUB6nmCB1Enki3r+L5kJveX9pq1SvAUKoICy6CZ9yD8xO086YXdYhvNjBdnekm4ZnaP5yC8Cs/1tA==",
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-        "lodash": "^4.2.0"
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-          "dev": true
-        }
+        "@babel/code-frame": "^7.10.4",
+        "@babel/parser": "^7.10.4",
+        "@babel/types": "^7.10.4"
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+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.12.1.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/generator": "^7.12.1",
+        "@babel/helper-function-name": "^7.10.4",
+        "@babel/helper-split-export-declaration": "^7.11.0",
+        "@babel/parser": "^7.12.1",
+        "@babel/types": "^7.12.1",
+        "debug": "^4.1.0",
         "globals": "^11.1.0",
-        "invariant": "^2.2.0",
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               "version": "6.0.2",
               "bundled": true,
@@ -7279,13 +5572,30 @@
           }
         },
         "braces": {
-          "version": "1.8.5",
+          "version": "2.3.2",
           "bundled": true,
           "dev": true,
           "requires": {
-            "expand-range": "^1.8.1",
-            "preserve": "^0.2.0",
-            "repeat-element": "^1.1.2"
+            "arr-flatten": "^1.1.0",
+            "array-unique": "^0.3.2",
+            "extend-shallow": "^2.0.1",
+            "fill-range": "^4.0.0",
+            "isobject": "^3.0.1",
+            "repeat-element": "^1.1.2",
+            "snapdragon": "^0.8.1",
+            "snapdragon-node": "^2.0.1",
+            "split-string": "^3.0.2",
+            "to-regex": "^3.0.1"
+          },
+          "dependencies": {
+            "extend-shallow": {
+              "version": "2.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-extendable": "^0.1.0"
+              }
+            }
           }
         },
         "builtin-modules": {
@@ -7307,13 +5617,6 @@
             "to-object-path": "^0.3.0",
             "union-value": "^1.0.0",
             "unset-value": "^1.0.0"
-          },
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-              "bundled": true,
-              "dev": true
-            }
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@@ -7329,13 +5632,11 @@
         "camelcase": {
           "version": "1.2.1",
           "bundled": true,
-          "dev": true,
           "optional": true
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           "version": "0.1.3",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "align-text": "^0.1.3",
@@ -7372,18 +5673,12 @@
               "requires": {
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               }
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           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
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@@ -7394,7 +5689,6 @@
             "wordwrap": {
               "version": "0.0.2",
               "bundled": true,
-              "dev": true,
               "optional": true
             }
           }
@@ -7439,7 +5733,7 @@
           "dev": true
         },
         "core-js": {
-          "version": "2.5.5",
+          "version": "2.5.6",
           "bundled": true,
           "dev": true
         },
@@ -7467,8 +5761,7 @@
         },
         "decamelize": {
           "version": "1.2.0",
-          "bundled": true,
-          "dev": true
+          "bundled": true
         },
         "decode-uri-component": {
           "version": "0.2.0",
@@ -7518,11 +5811,6 @@
                 "kind-of": "^6.0.2"
               }
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-              "dev": true
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               "bundled": true,
@@ -7583,19 +5871,35 @@
           }
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-          "bundled": true,
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-          "requires": {
-            "is-posix-bracket": "^0.1.0"
-          }
-        },
-        "expand-range": {
-          "version": "1.8.2",
+          "version": "2.1.4",
           "bundled": true,
           "dev": true,
           "requires": {
-            "fill-range": "^2.1.0"
+            "debug": "^2.3.3",
+            "define-property": "^0.2.5",
+            "extend-shallow": "^2.0.1",
+            "posix-character-classes": "^0.1.0",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.1"
+          },
+          "dependencies": {
+            "define-property": {
+              "version": "0.2.5",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-descriptor": "^0.1.0"
+              }
+            },
+            "extend-shallow": {
+              "version": "2.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-extendable": "^0.1.0"
+              }
+            }
           }
         },
         "extend-shallow": {
@@ -7618,28 +5922,88 @@
           }
         },
         "extglob": {
-          "version": "0.3.2",
+          "version": "2.0.4",
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-extglob": "^1.0.0"
+            "array-unique": "^0.3.2",
+            "define-property": "^1.0.0",
+            "expand-brackets": "^2.1.4",
+            "extend-shallow": "^2.0.1",
+            "fragment-cache": "^0.2.1",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.1"
+          },
+          "dependencies": {
+            "define-property": {
+              "version": "1.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-descriptor": "^1.0.0"
+              }
+            },
+            "extend-shallow": {
+              "version": "2.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-extendable": "^0.1.0"
+              }
+            },
+            "is-accessor-descriptor": {
+              "version": "1.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "^6.0.0"
+              }
+            },
+            "is-data-descriptor": {
+              "version": "1.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "^6.0.0"
+              }
+            },
+            "is-descriptor": {
+              "version": "1.0.2",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-accessor-descriptor": "^1.0.0",
+                "is-data-descriptor": "^1.0.0",
+                "kind-of": "^6.0.2"
+              }
+            },
+            "kind-of": {
+              "version": "6.0.2",
+              "bundled": true,
+              "dev": true
+            }
           }
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-        "filename-regex": {
-          "version": "2.0.1",
-          "bundled": true,
-          "dev": true
-        },
         "fill-range": {
-          "version": "2.2.3",
+          "version": "4.0.0",
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-number": "^2.1.0",
-            "isobject": "^2.0.0",
-            "randomatic": "^1.1.3",
-            "repeat-element": "^1.1.2",
-            "repeat-string": "^1.5.2"
+            "extend-shallow": "^2.0.1",
+            "is-number": "^3.0.0",
+            "repeat-string": "^1.6.1",
+            "to-regex-range": "^2.1.0"
+          },
+          "dependencies": {
+            "extend-shallow": {
+              "version": "2.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-extendable": "^0.1.0"
+              }
+            }
           }
         },
         "find-cache-dir": {
@@ -7665,14 +6029,6 @@
           "bundled": true,
           "dev": true
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-        "for-own": {
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-          "dev": true,
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           "bundled": true,
@@ -7723,23 +6079,6 @@
             "path-is-absolute": "^1.0.0"
           }
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-          "bundled": true,
-          "dev": true,
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-          "bundled": true,
-          "dev": true,
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           "bundled": true,
@@ -7750,27 +6089,6 @@
           "bundled": true,
           "dev": true
         },
-        "handlebars": {
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-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "async": "^1.4.0",
-            "optimist": "^0.6.1",
-            "source-map": "^0.4.4",
-            "uglify-js": "^2.6"
-          },
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-              "bundled": true,
-              "dev": true,
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         "has-ansi": {
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           "bundled": true,
@@ -7792,13 +6110,6 @@
             "get-value": "^2.0.6",
             "has-values": "^1.0.0",
             "isobject": "^3.0.0"
-          },
-          "dependencies": {
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-              "bundled": true,
-              "dev": true
-            }
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         },
         "has-values": {
@@ -7810,24 +6121,6 @@
             "kind-of": "^4.0.0"
           },
           "dependencies": {
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-              "bundled": true,
-              "dev": true,
-              "requires": {
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-                  "bundled": true,
-                  "dev": true,
-                  "requires": {
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-                  }
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             "kind-of": {
               "version": "4.0.0",
               "bundled": true,
@@ -7838,11 +6131,6 @@
             }
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         "imurmurhash": {
           "version": "0.1.4",
           "bundled": true,
@@ -7890,8 +6178,7 @@
         },
         "is-buffer": {
           "version": "1.1.6",
-          "bundled": true,
-          "dev": true
+          "bundled": true
         },
         "is-builtin-module": {
           "version": "1.0.0",
@@ -7926,29 +6213,11 @@
             }
           }
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-        "is-dotfile": {
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-          "bundled": true,
-          "dev": true
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-        "is-equal-shallow": {
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-          "bundled": true,
-          "dev": true,
-          "requires": {
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           "bundled": true,
           "dev": true
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-          "bundled": true,
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           "version": "1.0.2",
           "bundled": true,
@@ -7962,16 +6231,8 @@
           "bundled": true,
           "dev": true
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-        "is-glob": {
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-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "is-extglob": "^1.0.0"
-          }
-        },
         "is-number": {
-          "version": "2.1.0",
+          "version": "3.0.0",
           "bundled": true,
           "dev": true,
           "requires": {
@@ -7999,25 +6260,8 @@
           "dev": true,
           "requires": {
             "isobject": "^3.0.1"
-          },
-          "dependencies": {
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-              "bundled": true,
-              "dev": true
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-          "bundled": true,
-          "dev": true
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-          "dev": true
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           "version": "1.1.0",
           "bundled": true,
@@ -8044,12 +6288,9 @@
           "dev": true
         },
         "isobject": {
-          "version": "2.1.0",
+          "version": "3.0.1",
           "bundled": true,
-          "dev": true,
-          "requires": {
-            "isarray": "1.0.0"
-          }
+          "dev": true
         },
         "istanbul-lib-coverage": {
           "version": "1.2.0",
@@ -8142,7 +6383,6 @@
         "kind-of": {
           "version": "3.2.2",
           "bundled": true,
-          "dev": true,
           "requires": {
             "is-buffer": "^1.1.5"
           }
@@ -8150,7 +6390,6 @@
         "lazy-cache": {
           "version": "1.0.4",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "lcid": {
@@ -8189,15 +6428,10 @@
             }
           }
         },
-        "lodash": {
-          "version": "4.17.5",
-          "bundled": true,
-          "dev": true
-        },
         "longest": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "optional": true
         },
         "loose-envify": {
           "version": "1.3.1",
@@ -8208,7 +6442,7 @@
           }
         },
         "lru-cache": {
-          "version": "4.1.2",
+          "version": "4.1.3",
           "bundled": true,
           "dev": true,
           "requires": {
@@ -8266,23 +6500,30 @@
           }
         },
         "micromatch": {
-          "version": "2.3.11",
+          "version": "3.1.10",
           "bundled": true,
           "dev": true,
           "requires": {
-            "arr-diff": "^2.0.0",
-            "array-unique": "^0.2.1",
-            "braces": "^1.8.2",
-            "expand-brackets": "^0.1.4",
-            "extglob": "^0.3.1",
-            "filename-regex": "^2.0.0",
-            "is-extglob": "^1.0.0",
-            "is-glob": "^2.0.1",
-            "kind-of": "^3.0.2",
-            "normalize-path": "^2.0.1",
-            "object.omit": "^2.0.0",
-            "parse-glob": "^3.0.4",
-            "regex-cache": "^0.4.2"
+            "arr-diff": "^4.0.0",
+            "array-unique": "^0.3.2",
+            "braces": "^2.3.1",
+            "define-property": "^2.0.2",
+            "extend-shallow": "^3.0.2",
+            "extglob": "^2.0.4",
+            "fragment-cache": "^0.2.1",
+            "kind-of": "^6.0.2",
+            "nanomatch": "^1.2.9",
+            "object.pick": "^1.3.0",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "6.0.2",
+              "bundled": true,
+              "dev": true
+            }
           }
         },
         "mimic-fn": {
@@ -8300,8 +6541,7 @@
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true,
-          "dev": true
+          "bundled": true
         },
         "mixin-deep": {
           "version": "1.3.1",
@@ -8354,16 +6594,6 @@
             "to-regex": "^3.0.1"
           },
           "dependencies": {
-            "arr-diff": {
-              "version": "4.0.0",
-              "bundled": true,
-              "dev": true
-            },
-            "array-unique": {
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-              "bundled": true,
-              "dev": true
-            },
             "kind-of": {
               "version": "6.0.2",
               "bundled": true,
@@ -8382,14 +6612,6 @@
             "validate-npm-package-license": "^3.0.1"
           }
         },
-        "normalize-path": {
-          "version": "2.1.1",
-          "bundled": true,
-          "dev": true,
-          "requires": {
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-          }
-        },
         "npm-run-path": {
           "version": "2.0.2",
           "bundled": true,
@@ -8418,38 +6640,22 @@
             "kind-of": "^3.0.3"
           },
           "dependencies": {
-            "define-property": {
-              "version": "0.2.5",
-              "bundled": true,
-              "dev": true,
-              "requires": {
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-              }
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-        },
-        "object-visit": {
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-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "isobject": "^3.0.0"
-          },
-          "dependencies": {
-            "isobject": {
-              "version": "3.0.1",
+            "define-property": {
+              "version": "0.2.5",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "requires": {
+                "is-descriptor": "^0.1.0"
+              }
             }
           }
         },
-        "object.omit": {
-          "version": "2.0.1",
+        "object-visit": {
+          "version": "1.0.1",
           "bundled": true,
           "dev": true,
           "requires": {
-            "for-own": "^0.1.4",
-            "is-extendable": "^0.1.1"
+            "isobject": "^3.0.0"
           }
         },
         "object.pick": {
@@ -8458,13 +6664,6 @@
           "dev": true,
           "requires": {
             "isobject": "^3.0.1"
-          },
-          "dependencies": {
-            "isobject": {
-              "version": "3.0.1",
-              "bundled": true,
-              "dev": true
-            }
           }
         },
         "once": {
@@ -8478,7 +6677,6 @@
         "optimist": {
           "version": "0.6.1",
           "bundled": true,
-          "dev": true,
           "requires": {
             "minimist": "~0.0.1",
             "wordwrap": "~0.0.2"
@@ -8525,17 +6723,6 @@
           "bundled": true,
           "dev": true
         },
-        "parse-glob": {
-          "version": "3.0.4",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "glob-base": "^0.3.0",
-            "is-dotfile": "^1.0.0",
-            "is-extglob": "^1.0.0",
-            "is-glob": "^2.0.0"
-          }
-        },
         "parse-json": {
           "version": "2.2.0",
           "bundled": true,
@@ -8624,53 +6811,11 @@
           "bundled": true,
           "dev": true
         },
-        "preserve": {
-          "version": "0.2.0",
-          "bundled": true,
-          "dev": true
-        },
         "pseudomap": {
           "version": "1.0.2",
           "bundled": true,
           "dev": true
         },
-        "randomatic": {
-          "version": "1.1.7",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "is-number": "^3.0.0",
-            "kind-of": "^4.0.0"
-          },
-          "dependencies": {
-            "is-number": {
-              "version": "3.0.0",
-              "bundled": true,
-              "dev": true,
-              "requires": {
-                "kind-of": "^3.0.2"
-              },
-              "dependencies": {
-                "kind-of": {
-                  "version": "3.2.2",
-                  "bundled": true,
-                  "dev": true,
-                  "requires": {
-                    "is-buffer": "^1.1.5"
-                  }
-                }
-              }
-            },
-            "kind-of": {
-              "version": "4.0.0",
-              "bundled": true,
-              "dev": true,
-              "requires": {
-                "is-buffer": "^1.1.5"
-              }
-            }
-          }
-        },
         "read-pkg": {
           "version": "1.1.0",
           "bundled": true,
@@ -8706,14 +6851,6 @@
           "bundled": true,
           "dev": true
         },
-        "regex-cache": {
-          "version": "0.4.4",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "is-equal-shallow": "^0.1.3"
-          }
-        },
         "regex-not": {
           "version": "1.0.2",
           "bundled": true,
@@ -8723,11 +6860,6 @@
             "safe-regex": "^1.1.0"
           }
         },
-        "remove-trailing-separator": {
-          "version": "1.1.0",
-          "bundled": true,
-          "dev": true
-        },
         "repeat-element": {
           "version": "1.1.2",
           "bundled": true,
@@ -8735,8 +6867,7 @@
         },
         "repeat-string": {
           "version": "1.6.1",
-          "bundled": true,
-          "dev": true
+          "bundled": true
         },
         "repeating": {
           "version": "2.0.1",
@@ -8774,7 +6905,6 @@
         "right-align": {
           "version": "0.1.3",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "align-text": "^0.1.1"
@@ -8927,11 +7057,6 @@
                 "kind-of": "^6.0.2"
               }
             },
-            "isobject": {
-              "version": "3.0.1",
-              "bundled": true,
-              "dev": true
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+      "dev": true,
+      "requires": {
+        "camelcase": "^4.1.0"
+      }
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-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
-      "integrity": "sha1-5a2ryKz0CPY4X8dklWhMiOavaJo=",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
       "dev": true
     }
   }
diff --git a/package.json b/package.json
index e9c9258b..d0ec6c91 100644
--- a/package.json
+++ b/package.json
@@ -21,6 +21,7 @@
     "lint:js": "eslint src/js && eslint test/js",
     "lint:ts": "tslint -c tslint.json 'src/ts/**/*.ts' && tslint -c tslint.json 'test/ts/**/*.ts'",
     "lint": "npm run lint:js && npm run lint:ts",
+    "eslintFix": "eslint src/js --fix && eslint test/js --fix",
     "test:js": "mocha --compilers js:babel-core/register ./test/js  --recursive --reporter mochawesome",
     "test:ts": "mocha -r ts-node/register ./test/ts/**/*.spec.ts ./test/ts/**/**/*.spec.ts --recursive",
     "test": "npm run test:js && npm run test:ts",
@@ -57,29 +58,29 @@
     "@types/chai": "^4.1.2",
     "@types/mocha": "^5.0.0",
     "babel-cli": "^6.26.0",
-    "babel-core": "^6.26.0",
-    "babel-eslint": "^8.2.2",
-    "babel-loader": "^7.1.4",
-    "babel-plugin-add-module-exports": "^0.2.1",
+    "babel-core": "^6.26.3",
+    "babel-eslint": "^10.0.1",
+    "babel-loader": "^8.0.5",
+    "babel-plugin-add-module-exports": "^1.0.0",
     "babel-plugin-transform-es2015-modules-umd": "^6.24.1",
-    "babel-preset-env": "^1.6.1",
+    "babel-preset-env": "^1.7.0",
     "chai": "^4.1.2",
-    "codecov": "^3.0.0",
-    "eslint": "^4.18.2",
-    "eslint-config-airbnb-base": "^12.1.0",
-    "eslint-plugin-import": "^2.9.0",
+    "codecov": "^3.7.1",
+    "eslint": "^5.15.1",
+    "eslint-config-airbnb-base": "^13.1.0",
+    "eslint-plugin-import": "^2.16.0",
     "istanbul": "^v1.1.0-alpha.1",
     "mocha": "^5.0.4",
     "mochawesome": "^3.0.2",
     "nyc": "11.7.2",
-    "ts-node": "^5.0.1",
-    "tslint": "^5.9.1",
-    "typescript": "^2.7.2",
-    "webpack": "^4.1.1",
-    "webpack-cli": "2.1.1",
-    "yargs": "^11.0.0"
+    "ts-node": "8.0.3",
+    "tslint": "5.14.0",
+    "typescript": "3.3.3333",
+    "webpack": "^4.29.6",
+    "webpack-cli": "3.3.0",
+    "yargs": "^16.1.0"
   },
   "dependencies": {
-    "http-server": "^0.11.1"
+    "http-server": "^0.12.3"
   }
 }
diff --git a/src/js/algorithms/backtracking/sudoku-solver.js b/src/js/algorithms/backtracking/sudoku-solver.js
index 48d98bd5..6e1a76fc 100644
--- a/src/js/algorithms/backtracking/sudoku-solver.js
+++ b/src/js/algorithms/backtracking/sudoku-solver.js
@@ -31,9 +31,9 @@ function usedInBox(matrix, boxStartRow, boxStartCol, num) {
 
 function isSafe(matrix, row, col, num) {
   return (
-    !usedInRow(matrix, row, num) &&
-    !usedInCol(matrix, col, num) &&
-    !usedInBox(matrix, row - (row % 3), col - (col % 3), num)
+    !usedInRow(matrix, row, num)
+    && !usedInCol(matrix, col, num)
+    && !usedInBox(matrix, row - (row % 3), col - (col % 3), num)
   );
 }
 function solveSudoku(matrix) {
diff --git a/src/js/algorithms/dynamic-programing/matrix-chain-multiplication.js b/src/js/algorithms/dynamic-programing/matrix-chain-multiplication.js
index ae155cb3..143f5772 100644
--- a/src/js/algorithms/dynamic-programing/matrix-chain-multiplication.js
+++ b/src/js/algorithms/dynamic-programing/matrix-chain-multiplication.js
@@ -43,4 +43,3 @@ export function matrixChainOrder(p) {
   printOptimalParenthesis(s, 1, n - 1);
   return m[1][n - 1];
 }
-
diff --git a/src/js/algorithms/dynamic-programing/min-coin-change.js b/src/js/algorithms/dynamic-programing/min-coin-change.js
index 5456cd30..a477c804 100644
--- a/src/js/algorithms/dynamic-programing/min-coin-change.js
+++ b/src/js/algorithms/dynamic-programing/min-coin-change.js
@@ -18,9 +18,9 @@ export function minCoinChange(coins, amount) {
         newMin = makeChange(newAmount);
       }
       if (
-        newAmount >= 0 &&
-        (newMin.length < min.length - 1 || !min.length) &&
-        (newMin.length || !newAmount)
+        newAmount >= 0
+        && (newMin.length < min.length - 1 || !min.length)
+        && (newMin.length || !newAmount)
       ) {
         min = [coin].concat(newMin);
         // console.log('new Min ' + min + ' for ' + amount);
diff --git a/src/js/algorithms/greedy/matrix-chain-multiplication.js b/src/js/algorithms/greedy/matrix-chain-multiplication.js
index 9909eab2..63c5b4ae 100644
--- a/src/js/algorithms/greedy/matrix-chain-multiplication.js
+++ b/src/js/algorithms/greedy/matrix-chain-multiplication.js
@@ -4,8 +4,8 @@ export function matrixChainOrder(p, i = 1, j = p.length - 1) {
   }
   let min = Number.MAX_SAFE_INTEGER;
   for (let k = i; k < j; k++) {
-    const count =
-      matrixChainOrder(p, i, k) + matrixChainOrder(p, k + 1, j) + ((p[i - 1] * p[k]) * p[j]);
+    const count = matrixChainOrder(p, i, k)
+      + matrixChainOrder(p, k + 1, j) + ((p[i - 1] * p[k]) * p[j]);
     if (count < min) {
       min = count;
     }
diff --git a/src/js/algorithms/search/interpolation-search.js b/src/js/algorithms/search/interpolation-search.js
index e2153349..2f9f7278 100644
--- a/src/js/algorithms/search/interpolation-search.js
+++ b/src/js/algorithms/search/interpolation-search.js
@@ -21,9 +21,9 @@ export function interpolationSearch(
   let position = -1;
   let delta = -1;
   while (
-    low <= high &&
-    biggerEquals(value, array[low], compareFn) &&
-    lesserEquals(value, array[high], compareFn)
+    low <= high
+    && biggerEquals(value, array[low], compareFn)
+    && lesserEquals(value, array[high], compareFn)
   ) {
     delta = diffFn(value, array[low]) / diffFn(array[high], array[low]);
     position = low + Math.floor((high - low) * delta);
diff --git a/src/js/data-structures/avl-tree.js b/src/js/data-structures/avl-tree.js
index 108716e5..8ea3cfb9 100644
--- a/src/js/data-structures/avl-tree.js
+++ b/src/js/data-structures/avl-tree.js
@@ -16,12 +16,14 @@ export default class AVLTree extends BinarySearchTree {
     this.compareFn = compareFn;
     this.root = null;
   }
+
   getNodeHeight(node) {
     if (node == null) {
       return -1;
     }
     return Math.max(this.getNodeHeight(node.left), this.getNodeHeight(node.right)) + 1;
   }
+
   /**
    * Left left case: rotate right
    *
@@ -39,6 +41,7 @@ export default class AVLTree extends BinarySearchTree {
     tmp.right = node;
     return tmp;
   }
+
   /**
    * Right right case: rotate left
    *
@@ -56,6 +59,7 @@ export default class AVLTree extends BinarySearchTree {
     tmp.left = node;
     return tmp;
   }
+
   /**
    * Left right case: rotate left then right
    * @param node Node<T>
@@ -64,6 +68,7 @@ export default class AVLTree extends BinarySearchTree {
     node.left = this.rotationRR(node.left);
     return this.rotationLL(node);
   }
+
   /**
    * Right left case: rotate right then left
    * @param node Node<T>
@@ -72,6 +77,7 @@ export default class AVLTree extends BinarySearchTree {
     node.right = this.rotationLL(node.right);
     return this.rotationRR(node);
   }
+
   getBalanceFactor(node) {
     const heightDifference = this.getNodeHeight(node.left) - this.getNodeHeight(node.right);
     switch (heightDifference) {
@@ -87,13 +93,15 @@ export default class AVLTree extends BinarySearchTree {
         return BalanceFactor.BALANCED;
     }
   }
+
   insert(key) {
     this.root = this.insertNode(this.root, key);
   }
+
   insertNode(node, key) {
     if (node == null) {
       return new Node(key);
-    } else if (this.compareFn(key, node.key) === Compare.LESS_THAN) {
+    } if (this.compareFn(key, node.key) === Compare.LESS_THAN) {
       node.left = this.insertNode(node.left, key);
     } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {
       node.right = this.insertNode(node.right, key);
@@ -122,6 +130,7 @@ export default class AVLTree extends BinarySearchTree {
     }
     return node;
   }
+
   removeNode(node, key) {
     node = super.removeNode(node, key); // {1}
     if (node == null) {
@@ -132,8 +141,8 @@ export default class AVLTree extends BinarySearchTree {
     if (balanceFactor === BalanceFactor.UNBALANCED_LEFT) {
       // Left left case
       if (
-        this.getBalanceFactor(node.left) === BalanceFactor.BALANCED ||
-        this.getBalanceFactor(node.left) === BalanceFactor.SLIGHTLY_UNBALANCED_LEFT
+        this.getBalanceFactor(node.left) === BalanceFactor.BALANCED
+        || this.getBalanceFactor(node.left) === BalanceFactor.SLIGHTLY_UNBALANCED_LEFT
       ) {
         return this.rotationLL(node);
       }
@@ -145,8 +154,8 @@ export default class AVLTree extends BinarySearchTree {
     if (balanceFactor === BalanceFactor.UNBALANCED_RIGHT) {
       // Right right case
       if (
-        this.getBalanceFactor(node.right) === BalanceFactor.BALANCED ||
-        this.getBalanceFactor(node.right) === BalanceFactor.SLIGHTLY_UNBALANCED_RIGHT
+        this.getBalanceFactor(node.right) === BalanceFactor.BALANCED
+        || this.getBalanceFactor(node.right) === BalanceFactor.SLIGHTLY_UNBALANCED_RIGHT
       ) {
         return this.rotationRR(node);
       }
diff --git a/src/js/data-structures/binary-search-tree.js b/src/js/data-structures/binary-search-tree.js
index 0dbe9519..98795a16 100644
--- a/src/js/data-structures/binary-search-tree.js
+++ b/src/js/data-structures/binary-search-tree.js
@@ -6,6 +6,7 @@ export default class BinarySearchTree {
     this.compareFn = compareFn;
     this.root = undefined;
   }
+
   insert(key) {
     // special case: first key
     if (this.root == null) {
@@ -14,6 +15,7 @@ export default class BinarySearchTree {
       this.insertNode(this.root, key);
     }
   }
+
   insertNode(node, key) {
     if (this.compareFn(key, node.key) === Compare.LESS_THAN) {
       if (node.left == null) {
@@ -27,26 +29,31 @@ export default class BinarySearchTree {
       this.insertNode(node.right, key);
     }
   }
+
   getRoot() {
     return this.root;
   }
+
   search(key) {
     return this.searchNode(this.root, key);
   }
+
   searchNode(node, key) {
     if (node == null) {
       return false;
     }
     if (this.compareFn(key, node.key) === Compare.LESS_THAN) {
       return this.searchNode(node.left, key);
-    } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {
+    } if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {
       return this.searchNode(node.right, key);
     }
     return true;
   }
+
   inOrderTraverse(callback) {
     this.inOrderTraverseNode(this.root, callback);
   }
+
   inOrderTraverseNode(node, callback) {
     if (node != null) {
       this.inOrderTraverseNode(node.left, callback);
@@ -54,9 +61,11 @@ export default class BinarySearchTree {
       this.inOrderTraverseNode(node.right, callback);
     }
   }
+
   preOrderTraverse(callback) {
     this.preOrderTraverseNode(this.root, callback);
   }
+
   preOrderTraverseNode(node, callback) {
     if (node != null) {
       callback(node.key);
@@ -64,9 +73,11 @@ export default class BinarySearchTree {
       this.preOrderTraverseNode(node.right, callback);
     }
   }
+
   postOrderTraverse(callback) {
     this.postOrderTraverseNode(this.root, callback);
   }
+
   postOrderTraverseNode(node, callback) {
     if (node != null) {
       this.postOrderTraverseNode(node.left, callback);
@@ -74,9 +85,11 @@ export default class BinarySearchTree {
       callback(node.key);
     }
   }
+
   min() {
     return this.minNode(this.root);
   }
+
   minNode(node) {
     let current = node;
     while (current != null && current.left != null) {
@@ -84,9 +97,11 @@ export default class BinarySearchTree {
     }
     return current;
   }
+
   max() {
     return this.maxNode(this.root);
   }
+
   maxNode(node) {
     let current = node;
     while (current != null && current.right != null) {
@@ -94,9 +109,11 @@ export default class BinarySearchTree {
     }
     return current;
   }
+
   remove(key) {
     this.root = this.removeNode(this.root, key);
   }
+
   removeNode(node, key) {
     if (node == null) {
       return undefined;
@@ -104,7 +121,7 @@ export default class BinarySearchTree {
     if (this.compareFn(key, node.key) === Compare.LESS_THAN) {
       node.left = this.removeNode(node.left, key);
       return node;
-    } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {
+    } if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {
       node.right = this.removeNode(node.right, key);
       return node;
     }
@@ -122,7 +139,7 @@ export default class BinarySearchTree {
     if (node.left == null) {
       node = node.right;
       return node;
-    } else if (node.right == null) {
+    } if (node.right == null) {
       node = node.left;
       return node;
     }
diff --git a/src/js/data-structures/circular-linked-list.js b/src/js/data-structures/circular-linked-list.js
index cc565558..4209087a 100644
--- a/src/js/data-structures/circular-linked-list.js
+++ b/src/js/data-structures/circular-linked-list.js
@@ -6,6 +6,7 @@ export default class CircularLinkedList extends LinkedList {
   constructor(equalsFn = defaultEquals) {
     super(equalsFn);
   }
+
   push(element) {
     const node = new Node(element);
     let current;
@@ -19,6 +20,7 @@ export default class CircularLinkedList extends LinkedList {
     node.next = this.head;
     this.count++;
   }
+
   insert(element, index) {
     if (index >= 0 && index <= this.count) {
       const node = new Node(element);
@@ -45,6 +47,7 @@ export default class CircularLinkedList extends LinkedList {
     }
     return false;
   }
+
   removeAt(index) {
     if (index >= 0 && index < this.count) {
       let current = this.head;
diff --git a/src/js/data-structures/dictionary.js b/src/js/data-structures/dictionary.js
index 4ec6212a..2b0568bd 100644
--- a/src/js/data-structures/dictionary.js
+++ b/src/js/data-structures/dictionary.js
@@ -6,6 +6,7 @@ export default class Dictionary {
     this.toStrFn = toStrFn;
     this.table = {};
   }
+
   set(key, value) {
     if (key != null && value != null) {
       const tableKey = this.toStrFn(key);
@@ -14,13 +15,16 @@ export default class Dictionary {
     }
     return false;
   }
+
   get(key) {
     const valuePair = this.table[this.toStrFn(key)];
     return valuePair == null ? undefined : valuePair.value;
   }
+
   hasKey(key) {
     return this.table[this.toStrFn(key)] != null;
   }
+
   remove(key) {
     if (this.hasKey(key)) {
       delete this.table[this.toStrFn(key)];
@@ -28,15 +32,19 @@ export default class Dictionary {
     }
     return false;
   }
+
   values() {
     return this.keyValues().map(valuePair => valuePair.value);
   }
+
   keys() {
     return this.keyValues().map(valuePair => valuePair.key);
   }
+
   keyValues() {
     return Object.values(this.table);
   }
+
   forEach(callbackFn) {
     const valuePairs = this.keyValues();
     for (let i = 0; i < valuePairs.length; i++) {
@@ -46,15 +54,19 @@ export default class Dictionary {
       }
     }
   }
+
   isEmpty() {
     return this.size() === 0;
   }
+
   size() {
     return Object.keys(this.table).length;
   }
+
   clear() {
     this.table = {};
   }
+
   toString() {
     if (this.isEmpty()) {
       return '';
diff --git a/src/js/data-structures/doubly-linked-list.js b/src/js/data-structures/doubly-linked-list.js
index 8960e173..e6547ec4 100644
--- a/src/js/data-structures/doubly-linked-list.js
+++ b/src/js/data-structures/doubly-linked-list.js
@@ -7,6 +7,7 @@ export default class DoublyLinkedList extends LinkedList {
     super(equalsFn);
     this.tail = undefined;
   }
+
   push(element) {
     const node = new DoublyNode(element);
     if (this.head == null) {
@@ -20,6 +21,7 @@ export default class DoublyLinkedList extends LinkedList {
     }
     this.count++;
   }
+
   insert(element, index) {
     if (index >= 0 && index <= this.count) {
       const node = new DoublyNode(element);
@@ -51,6 +53,7 @@ export default class DoublyLinkedList extends LinkedList {
     }
     return false;
   }
+
   removeAt(index) {
     if (index >= 0 && index < this.count) {
       let current = this.head;
@@ -80,6 +83,7 @@ export default class DoublyLinkedList extends LinkedList {
     }
     return undefined;
   }
+
   indexOf(element) {
     let current = this.head;
     let index = 0;
@@ -92,16 +96,20 @@ export default class DoublyLinkedList extends LinkedList {
     }
     return -1;
   }
+
   getHead() {
     return this.head;
   }
+
   getTail() {
     return this.tail;
   }
+
   clear() {
     super.clear();
     this.tail = undefined;
   }
+
   toString() {
     if (this.head == null) {
       return '';
@@ -114,6 +122,7 @@ export default class DoublyLinkedList extends LinkedList {
     }
     return objString;
   }
+
   inverseToString() {
     if (this.tail == null) {
       return '';
diff --git a/src/js/data-structures/graph.js b/src/js/data-structures/graph.js
index d8c92044..f9bfbe51 100644
--- a/src/js/data-structures/graph.js
+++ b/src/js/data-structures/graph.js
@@ -6,12 +6,14 @@ export default class Graph {
     this.vertices = [];
     this.adjList = new Dictionary();
   }
+
   addVertex(v) {
     if (!this.vertices.includes(v)) {
       this.vertices.push(v);
       this.adjList.set(v, []); // initialize adjacency list with array as well;
     }
   }
+
   addEdge(a, b) {
     if (!this.adjList.get(a)) {
       this.addVertex(a);
@@ -24,12 +26,15 @@ export default class Graph {
       this.adjList.get(b).push(a);
     }
   }
+
   getVertices() {
     return this.vertices;
   }
+
   getAdjList() {
     return this.adjList;
   }
+
   toString() {
     let s = '';
     for (let i = 0; i < this.vertices.length; i++) {
diff --git a/src/js/data-structures/hash-table-linear-probing-lazy.js b/src/js/data-structures/hash-table-linear-probing-lazy.js
index 57038d0f..d7314f0e 100644
--- a/src/js/data-structures/hash-table-linear-probing-lazy.js
+++ b/src/js/data-structures/hash-table-linear-probing-lazy.js
@@ -6,6 +6,7 @@ export default class HashTableLinearProbingLazy {
     this.toStrFn = toStrFn;
     this.table = {};
   }
+
   loseloseHashCode(key) {
     if (typeof key === 'number') {
       return key;
@@ -17,15 +18,17 @@ export default class HashTableLinearProbingLazy {
     }
     return hash % 37;
   }
+
   hashCode(key) {
     return this.loseloseHashCode(key);
   }
+
   put(key, value) {
     if (key != null && value != null) {
       const position = this.hashCode(key);
       if (
-        this.table[position] == null ||
-        (this.table[position] != null && this.table[position].isDeleted)
+        this.table[position] == null
+        || (this.table[position] != null && this.table[position].isDeleted)
       ) {
         this.table[position] = new ValuePairLazy(key, value);
       } else {
@@ -39,6 +42,7 @@ export default class HashTableLinearProbingLazy {
     }
     return false;
   }
+
   get(key) {
     const position = this.hashCode(key);
     if (this.table[position] != null) {
@@ -47,8 +51,8 @@ export default class HashTableLinearProbingLazy {
       }
       let index = position + 1;
       while (
-        this.table[index] != null &&
-        (this.table[index].key !== key || this.table[index].isDeleted)
+        this.table[index] != null
+        && (this.table[index].key !== key || this.table[index].isDeleted)
       ) {
         if (this.table[index].key === key && this.table[index].isDeleted) {
           return undefined;
@@ -56,15 +60,16 @@ export default class HashTableLinearProbingLazy {
         index++;
       }
       if (
-        this.table[index] != null &&
-        this.table[index].key === key &&
-        !this.table[index].isDeleted
+        this.table[index] != null
+        && this.table[index].key === key
+        && !this.table[index].isDeleted
       ) {
         return this.table[position].value;
       }
     }
     return undefined;
   }
+
   remove(key) {
     const position = this.hashCode(key);
     if (this.table[position] != null) {
@@ -74,15 +79,15 @@ export default class HashTableLinearProbingLazy {
       }
       let index = position + 1;
       while (
-        this.table[index] != null &&
-        (this.table[index].key !== key || this.table[index].isDeleted)
+        this.table[index] != null
+        && (this.table[index].key !== key || this.table[index].isDeleted)
       ) {
         index++;
       }
       if (
-        this.table[index] != null &&
-        this.table[index].key === key &&
-        !this.table[index].isDeleted
+        this.table[index] != null
+        && this.table[index].key === key
+        && !this.table[index].isDeleted
       ) {
         this.table[index].isDeleted = true;
         return true;
@@ -90,9 +95,11 @@ export default class HashTableLinearProbingLazy {
     }
     return false;
   }
+
   isEmpty() {
     return this.size() === 0;
   }
+
   size() {
     let count = 0;
     Object.values(this.table).forEach(valuePair => {
@@ -100,12 +107,15 @@ export default class HashTableLinearProbingLazy {
     });
     return count;
   }
+
   clear() {
     this.table = {};
   }
+
   getTable() {
     return this.table;
   }
+
   toString() {
     if (this.isEmpty()) {
       return '';
diff --git a/src/js/data-structures/hash-table-linear-probing.js b/src/js/data-structures/hash-table-linear-probing.js
index 940d764a..2b7af8b2 100644
--- a/src/js/data-structures/hash-table-linear-probing.js
+++ b/src/js/data-structures/hash-table-linear-probing.js
@@ -6,6 +6,7 @@ export default class HashTableLinearProbing {
     this.toStrFn = toStrFn;
     this.table = {};
   }
+
   loseloseHashCode(key) {
     if (typeof key === 'number') {
       return key;
@@ -17,9 +18,11 @@ export default class HashTableLinearProbing {
     }
     return hash % 37;
   }
+
   hashCode(key) {
     return this.loseloseHashCode(key);
   }
+
   put(key, value) {
     if (key != null && value != null) {
       const position = this.hashCode(key);
@@ -36,6 +39,7 @@ export default class HashTableLinearProbing {
     }
     return false;
   }
+
   get(key) {
     const position = this.hashCode(key);
     if (this.table[position] != null) {
@@ -52,6 +56,7 @@ export default class HashTableLinearProbing {
     }
     return undefined;
   }
+
   remove(key) {
     const position = this.hashCode(key);
     if (this.table[position] != null) {
@@ -72,6 +77,7 @@ export default class HashTableLinearProbing {
     }
     return false;
   }
+
   verifyRemoveSideEffect(key, removedPosition) {
     const hash = this.hashCode(key);
     let index = removedPosition + 1;
@@ -85,18 +91,23 @@ export default class HashTableLinearProbing {
       index++;
     }
   }
+
   isEmpty() {
     return this.size() === 0;
   }
+
   size() {
     return Object.keys(this.table).length;
   }
+
   clear() {
     this.table = {};
   }
+
   getTable() {
     return this.table;
   }
+
   toString() {
     if (this.isEmpty()) {
       return '';
diff --git a/src/js/data-structures/hash-table-separate-chaining.js b/src/js/data-structures/hash-table-separate-chaining.js
index c00c277c..c8646ae9 100644
--- a/src/js/data-structures/hash-table-separate-chaining.js
+++ b/src/js/data-structures/hash-table-separate-chaining.js
@@ -7,6 +7,7 @@ export default class HashTableSeparateChaining {
     this.toStrFn = toStrFn;
     this.table = {};
   }
+
   loseloseHashCode(key) {
     if (typeof key === 'number') {
       return key;
@@ -18,9 +19,11 @@ export default class HashTableSeparateChaining {
     }
     return hash % 37;
   }
+
   hashCode(key) {
     return this.loseloseHashCode(key);
   }
+
   put(key, value) {
     if (key != null && value != null) {
       const position = this.hashCode(key);
@@ -32,6 +35,7 @@ export default class HashTableSeparateChaining {
     }
     return false;
   }
+
   get(key) {
     const position = this.hashCode(key);
     const linkedList = this.table[position];
@@ -46,6 +50,7 @@ export default class HashTableSeparateChaining {
     }
     return undefined;
   }
+
   remove(key) {
     const position = this.hashCode(key);
     const linkedList = this.table[position];
@@ -64,9 +69,11 @@ export default class HashTableSeparateChaining {
     }
     return false;
   }
+
   isEmpty() {
     return this.size() === 0;
   }
+
   size() {
     let count = 0;
     Object.values(this.table).forEach(linkedList => {
@@ -74,12 +81,15 @@ export default class HashTableSeparateChaining {
     });
     return count;
   }
+
   clear() {
     this.table = {};
   }
+
   getTable() {
     return this.table;
   }
+
   toString() {
     if (this.isEmpty()) {
       return '';
diff --git a/src/js/data-structures/hash-table.js b/src/js/data-structures/hash-table.js
index 725ac0b5..79bc51fd 100644
--- a/src/js/data-structures/hash-table.js
+++ b/src/js/data-structures/hash-table.js
@@ -6,6 +6,7 @@ export default class HashTable {
     this.toStrFn = toStrFn;
     this.table = {};
   }
+
   loseloseHashCode(key) {
     if (typeof key === 'number') {
       return key;
@@ -17,6 +18,7 @@ export default class HashTable {
     }
     return hash % 37;
   }
+
   /* djb2HashCode(key) {
     const tableKey = this.toStrFn(key);
     let hash = 5381;
@@ -28,6 +30,7 @@ export default class HashTable {
   hashCode(key) {
     return this.loseloseHashCode(key);
   }
+
   put(key, value) {
     if (key != null && value != null) {
       const position = this.hashCode(key);
@@ -36,10 +39,12 @@ export default class HashTable {
     }
     return false;
   }
+
   get(key) {
     const valuePair = this.table[this.hashCode(key)];
     return valuePair == null ? undefined : valuePair.value;
   }
+
   remove(key) {
     const hash = this.hashCode(key);
     const valuePair = this.table[hash];
@@ -49,18 +54,23 @@ export default class HashTable {
     }
     return false;
   }
+
   getTable() {
     return this.table;
   }
+
   isEmpty() {
     return this.size() === 0;
   }
+
   size() {
     return Object.keys(this.table).length;
   }
+
   clear() {
     this.table = {};
   }
+
   toString() {
     if (this.isEmpty()) {
       return '';
diff --git a/src/js/data-structures/heap.js b/src/js/data-structures/heap.js
index 044237e6..889e5957 100644
--- a/src/js/data-structures/heap.js
+++ b/src/js/data-structures/heap.js
@@ -1,34 +1,44 @@
-import { Compare, defaultCompare, reverseCompare, swap } from '../util';
+import {
+  Compare, defaultCompare, reverseCompare, swap
+} from '../util';
 
 export class MinHeap {
   constructor(compareFn = defaultCompare) {
     this.compareFn = compareFn;
     this.heap = [];
   }
+
   getLeftIndex(index) {
     return (2 * index) + 1;
   }
+
   getRightIndex(index) {
     return (2 * index) + 2;
   }
+
   getParentIndex(index) {
     if (index === 0) {
       return undefined;
     }
     return Math.floor((index - 1) / 2);
   }
+
   size() {
     return this.heap.length;
   }
+
   isEmpty() {
     return this.size() <= 0;
   }
+
   clear() {
     this.heap = [];
   }
+
   findMinimum() {
     return this.isEmpty() ? undefined : this.heap[0];
   }
+
   insert(value) {
     if (value != null) {
       const index = this.heap.length;
@@ -38,20 +48,21 @@ export class MinHeap {
     }
     return false;
   }
+
   siftDown(index) {
     let element = index;
     const left = this.getLeftIndex(index);
     const right = this.getRightIndex(index);
     const size = this.size();
     if (
-      left < size &&
-      this.compareFn(this.heap[element], this.heap[left]) === Compare.BIGGER_THAN
+      left < size
+      && this.compareFn(this.heap[element], this.heap[left]) === Compare.BIGGER_THAN
     ) {
       element = left;
     }
     if (
-      right < size &&
-      this.compareFn(this.heap[element], this.heap[right]) === Compare.BIGGER_THAN
+      right < size
+      && this.compareFn(this.heap[element], this.heap[right]) === Compare.BIGGER_THAN
     ) {
       element = right;
     }
@@ -60,17 +71,19 @@ export class MinHeap {
       this.siftDown(element);
     }
   }
+
   siftUp(index) {
     let parent = this.getParentIndex(index);
     while (
-      index > 0 &&
-      this.compareFn(this.heap[parent], this.heap[index]) === Compare.BIGGER_THAN
+      index > 0
+      && this.compareFn(this.heap[parent], this.heap[index]) === Compare.BIGGER_THAN
     ) {
       swap(this.heap, parent, index);
       index = parent;
       parent = this.getParentIndex(index);
     }
   }
+
   extract() {
     if (this.isEmpty()) {
       return undefined;
@@ -83,6 +96,7 @@ export class MinHeap {
     this.siftDown(0);
     return removedValue;
   }
+
   heapify(array) {
     if (array) {
       this.heap = array;
@@ -93,6 +107,7 @@ export class MinHeap {
     }
     return this.heap;
   }
+
   getAsArray() {
     return this.heap;
   }
diff --git a/src/js/data-structures/linked-list.js b/src/js/data-structures/linked-list.js
index e9b2e16b..fdd32d8b 100644
--- a/src/js/data-structures/linked-list.js
+++ b/src/js/data-structures/linked-list.js
@@ -7,6 +7,7 @@ export default class LinkedList {
     this.count = 0;
     this.head = undefined;
   }
+
   push(element) {
     const node = new Node(element);
     let current;
@@ -22,6 +23,7 @@ export default class LinkedList {
     }
     this.count++;
   }
+
   getElementAt(index) {
     if (index >= 0 && index <= this.count) {
       let node = this.head;
@@ -32,6 +34,7 @@ export default class LinkedList {
     }
     return undefined;
   }
+
   insert(element, index) {
     if (index >= 0 && index <= this.count) {
       const node = new Node(element);
@@ -49,6 +52,7 @@ export default class LinkedList {
     }
     return false;
   }
+
   removeAt(index) {
     if (index >= 0 && index < this.count) {
       let current = this.head;
@@ -64,10 +68,12 @@ export default class LinkedList {
     }
     return undefined;
   }
+
   remove(element) {
     const index = this.indexOf(element);
     return this.removeAt(index);
   }
+
   indexOf(element) {
     let current = this.head;
     for (let i = 0; i < this.size() && current != null; i++) {
@@ -78,19 +84,24 @@ export default class LinkedList {
     }
     return -1;
   }
+
   isEmpty() {
     return this.size() === 0;
   }
+
   size() {
     return this.count;
   }
+
   getHead() {
     return this.head;
   }
+
   clear() {
     this.head = undefined;
     this.count = 0;
   }
+
   toString() {
     if (this.head == null) {
       return '';
diff --git a/src/js/data-structures/models/node.js b/src/js/data-structures/models/node.js
index 70339215..33b4f371 100644
--- a/src/js/data-structures/models/node.js
+++ b/src/js/data-structures/models/node.js
@@ -4,6 +4,7 @@ export class Node {
     this.left = undefined;
     this.right = undefined;
   }
+
   toString() {
     return `${this.key}`;
   }
diff --git a/src/js/data-structures/models/value-pair.js b/src/js/data-structures/models/value-pair.js
index b35a936a..7aa20025 100644
--- a/src/js/data-structures/models/value-pair.js
+++ b/src/js/data-structures/models/value-pair.js
@@ -3,6 +3,7 @@ export class ValuePair {
     this.key = key;
     this.value = value;
   }
+
   toString() {
     return `[#${this.key}: ${this.value}]`;
   }
diff --git a/src/js/data-structures/set.js b/src/js/data-structures/set.js
index 0203bb8b..0dc29a0c 100644
--- a/src/js/data-structures/set.js
+++ b/src/js/data-structures/set.js
@@ -2,6 +2,7 @@ export default class Set {
   constructor() {
     this.items = {};
   }
+
   add(element) {
     if (!this.has(element)) {
       this.items[element] = element;
@@ -9,6 +10,7 @@ export default class Set {
     }
     return false;
   }
+
   delete(element) {
     if (this.has(element)) {
       delete this.items[element];
@@ -16,18 +18,22 @@ export default class Set {
     }
     return false;
   }
+
   has(element) {
     return Object.prototype.hasOwnProperty.call(this.items, element);
   }
+
   values() {
     return Object.values(this.items);
   }
+
   union(otherSet) {
     const unionSet = new Set();
     this.values().forEach(value => unionSet.add(value));
     otherSet.values().forEach(value => unionSet.add(value));
     return unionSet;
   }
+
   intersection(otherSet) {
     const intersectionSet = new Set();
     const values = this.values();
@@ -45,6 +51,7 @@ export default class Set {
     });
     return intersectionSet;
   }
+
   difference(otherSet) {
     const differenceSet = new Set();
     this.values().forEach(value => {
@@ -54,6 +61,7 @@ export default class Set {
     });
     return differenceSet;
   }
+
   isSubsetOf(otherSet) {
     if (this.size() > otherSet.size()) {
       return false;
@@ -68,15 +76,19 @@ export default class Set {
     });
     return isSubset;
   }
+
   isEmpty() {
     return this.size() === 0;
   }
+
   size() {
     return Object.keys(this.items).length;
   }
+
   clear() {
     this.items = {};
   }
+
   toString() {
     if (this.isEmpty()) {
       return '';
diff --git a/src/js/data-structures/sorted-linked-list.js b/src/js/data-structures/sorted-linked-list.js
index 7b3bd468..6712f6a8 100644
--- a/src/js/data-structures/sorted-linked-list.js
+++ b/src/js/data-structures/sorted-linked-list.js
@@ -7,6 +7,7 @@ export default class SortedLinkedList extends LinkedList {
     this.equalsFn = equalsFn;
     this.compareFn = compareFn;
   }
+
   push(element) {
     if (this.isEmpty()) {
       super.push(element);
@@ -15,6 +16,7 @@ export default class SortedLinkedList extends LinkedList {
       super.insert(element, index);
     }
   }
+
   insert(element, index = 0) {
     if (this.isEmpty()) {
       return super.insert(element, index === 0 ? index : 0);
@@ -22,6 +24,7 @@ export default class SortedLinkedList extends LinkedList {
     const pos = this.getIndexNextSortedElement(element);
     return super.insert(element, pos);
   }
+
   getIndexNextSortedElement(element) {
     let current = this.head;
     let i = 0;
diff --git a/src/js/data-structures/stack-array.js b/src/js/data-structures/stack-array.js
index ec8642ad..1491eb2c 100644
--- a/src/js/data-structures/stack-array.js
+++ b/src/js/data-structures/stack-array.js
@@ -4,6 +4,7 @@ export default class StackArray {
   constructor() {
     this.items = [];
   }
+
   push(element) {
     this.items.push(element);
   }
diff --git a/src/js/data-structures/stack-linked-list.js b/src/js/data-structures/stack-linked-list.js
index cab8c5d5..902a5d78 100644
--- a/src/js/data-structures/stack-linked-list.js
+++ b/src/js/data-structures/stack-linked-list.js
@@ -4,9 +4,11 @@ export default class StackLinkedList {
   constructor() {
     this.items = new DoublyLinkedList();
   }
+
   push(element) {
     this.items.push(element);
   }
+
   pop() {
     if (this.isEmpty()) {
       return undefined;
@@ -14,21 +16,26 @@ export default class StackLinkedList {
     const result = this.items.removeAt(this.size() - 1);
     return result;
   }
+
   peek() {
     if (this.isEmpty()) {
       return undefined;
     }
     return this.items.getElementAt(this.size() - 1).element;
   }
+
   isEmpty() {
     return this.items.isEmpty();
   }
+
   size() {
     return this.items.size();
   }
+
   clear() {
     this.items.clear();
   }
+
   toString() {
     return this.items.toString();
   }
diff --git a/src/js/data-structures/stack.js b/src/js/data-structures/stack.js
index 081bab33..af9b297b 100644
--- a/src/js/data-structures/stack.js
+++ b/src/js/data-structures/stack.js
@@ -5,10 +5,12 @@ export default class Stack {
     this.count = 0;
     this.items = {};
   }
+
   push(element) {
     this.items[this.count] = element;
     this.count++;
   }
+
   pop() {
     if (this.isEmpty()) {
       return undefined;
@@ -18,18 +20,22 @@ export default class Stack {
     delete this.items[this.count];
     return result;
   }
+
   peek() {
     if (this.isEmpty()) {
       return undefined;
     }
     return this.items[this.count - 1];
   }
+
   isEmpty() {
     return this.count === 0;
   }
+
   size() {
     return this.count;
   }
+
   clear() {
     /* while (!this.isEmpty()) {
         this.pop();
@@ -37,6 +43,7 @@ export default class Stack {
     this.items = {};
     this.count = 0;
   }
+
   toString() {
     if (this.isEmpty()) {
       return '';
diff --git a/src/js/index.js b/src/js/index.js
index a79f2d30..fa359f81 100644
--- a/src/js/index.js
+++ b/src/js/index.js
@@ -36,11 +36,11 @@ export { default as HashTableLinearProbing } from './data-structures/hash-table-
 export { default as HashTableLinearProbingLazy } from './data-structures/hash-table-linear-probing-lazy';
 
 // chapter 08
-export { default as factorialIterative } from './others/factorial';
-export { default as factorial } from './others/factorial';
-export { default as fibonacci } from './others/fibonacci';
-export { default as fibonacciIterative } from './others/fibonacci';
-export { default as fibonacciMemoization } from './others/fibonacci';
+export { factorialIterative } from './others/factorial';
+export { factorial } from './others/factorial';
+export { fibonacci } from './others/fibonacci';
+export { fibonacciIterative } from './others/fibonacci';
+export { fibonacciMemoization } from './others/fibonacci';
 
 // chapter 09
 export { default as BinarySearchTree } from './data-structures/binary-search-tree';
diff --git a/src/js/others/palindrome-checker.js b/src/js/others/palindrome-checker.js
index 54210c7b..1551e26a 100644
--- a/src/js/others/palindrome-checker.js
+++ b/src/js/others/palindrome-checker.js
@@ -2,9 +2,9 @@ import Deque from '../data-structures/deque';
 
 export function palindromeChecker(aString) {
   if (
-    aString === undefined ||
-    aString === null ||
-    (aString !== null && aString.length === 0)
+    aString === undefined
+    || aString === null
+    || (aString !== null && aString.length === 0)
   ) {
     return false;
   }
diff --git a/src/js/util.js b/src/js/util.js
index f88d7bcd..9e780fba 100644
--- a/src/js/util.js
+++ b/src/js/util.js
@@ -30,9 +30,9 @@ export function defaultEquals(a, b) {
 export function defaultToString(item) {
   if (item === null) {
     return 'NULL';
-  } else if (item === undefined) {
+  } if (item === undefined) {
     return 'UNDEFINED';
-  } else if (typeof item === 'string' || item instanceof String) {
+  } if (typeof item === 'string' || item instanceof String) {
     return `${item}`;
   }
   return item.toString();
diff --git a/test/js/algorithms/search/binary-search-recursive.spec.js b/test/js/algorithms/search/binary-search-recursive.spec.js
index a93081e2..8aab4959 100644
--- a/test/js/algorithms/search/binary-search-recursive.spec.js
+++ b/test/js/algorithms/search/binary-search-recursive.spec.js
@@ -2,4 +2,3 @@ import { binarySearchRecursive } from '../../../../src/js/index';
 import { testSearchAlgorithm } from './search-algorithms-tests';
 
 testSearchAlgorithm(binarySearchRecursive, 'Binary Search Recursive');
-
diff --git a/test/js/algorithms/sorting/bubble-sort.spec.js b/test/js/algorithms/sorting/bubble-sort.spec.js
index fe3b31a2..b903df74 100644
--- a/test/js/algorithms/sorting/bubble-sort.spec.js
+++ b/test/js/algorithms/sorting/bubble-sort.spec.js
@@ -2,4 +2,3 @@ import { bubbleSort } from '../../../../src/js/index';
 import { testSortAlgorithm } from './sort-algorithm-tests';
 
 testSortAlgorithm(bubbleSort, 'Bubble Sort');
-
diff --git a/test/js/algorithms/sorting/heap-sort.spec.js b/test/js/algorithms/sorting/heap-sort.spec.js
index 75505e4e..ae3816dc 100644
--- a/test/js/algorithms/sorting/heap-sort.spec.js
+++ b/test/js/algorithms/sorting/heap-sort.spec.js
@@ -2,4 +2,3 @@ import { heapSort } from '../../../../src/js/index';
 import { testSortAlgorithm } from './sort-algorithm-tests';
 
 testSortAlgorithm(heapSort, 'Heap Sort');
-
diff --git a/test/js/algorithms/sorting/insertion-sort.spec.js b/test/js/algorithms/sorting/insertion-sort.spec.js
index 324e12c5..c28a69de 100644
--- a/test/js/algorithms/sorting/insertion-sort.spec.js
+++ b/test/js/algorithms/sorting/insertion-sort.spec.js
@@ -2,4 +2,3 @@ import { insertionSort } from '../../../../src/js/index';
 import { testSortAlgorithm } from './sort-algorithm-tests';
 
 testSortAlgorithm(insertionSort, 'Insertion Sort');
-
diff --git a/test/js/algorithms/sorting/merge-sort.spec.js b/test/js/algorithms/sorting/merge-sort.spec.js
index f46ca6bb..5b161785 100644
--- a/test/js/algorithms/sorting/merge-sort.spec.js
+++ b/test/js/algorithms/sorting/merge-sort.spec.js
@@ -2,4 +2,3 @@ import { mergeSort } from '../../../../src/js/index';
 import { testSortAlgorithm } from './sort-algorithm-tests';
 
 testSortAlgorithm(mergeSort, 'Merge Sort');
-
diff --git a/test/js/algorithms/sorting/quicksort.spec.js b/test/js/algorithms/sorting/quicksort.spec.js
index d23694db..0cbe027a 100644
--- a/test/js/algorithms/sorting/quicksort.spec.js
+++ b/test/js/algorithms/sorting/quicksort.spec.js
@@ -2,4 +2,3 @@ import { quickSort } from '../../../../src/js/index';
 import { testSortAlgorithm } from './sort-algorithm-tests';
 
 testSortAlgorithm(quickSort, 'Quick Sort');
-
diff --git a/test/js/algorithms/sorting/radix-sort.spec.js b/test/js/algorithms/sorting/radix-sort.spec.js
index b312af90..af6a5b07 100644
--- a/test/js/algorithms/sorting/radix-sort.spec.js
+++ b/test/js/algorithms/sorting/radix-sort.spec.js
@@ -2,4 +2,3 @@ import { radixSort } from '../../../../src/js/index';
 import { testSortAlgorithm } from './sort-algorithm-tests';
 
 testSortAlgorithm(radixSort, 'Radix Sort', { reverseCompare: false });
-
diff --git a/test/js/algorithms/sorting/selection-sort.spec.js b/test/js/algorithms/sorting/selection-sort.spec.js
index ad372942..3d6cd3cc 100644
--- a/test/js/algorithms/sorting/selection-sort.spec.js
+++ b/test/js/algorithms/sorting/selection-sort.spec.js
@@ -2,4 +2,3 @@ import { selectionSort } from '../../../../src/js/index';
 import { testSortAlgorithm } from './sort-algorithm-tests';
 
 testSortAlgorithm(selectionSort, 'Selection Sort');
-
diff --git a/test/js/algorithms/sorting/shell-sort.spec.js b/test/js/algorithms/sorting/shell-sort.spec.js
index eb9ba569..92aa33a5 100644
--- a/test/js/algorithms/sorting/shell-sort.spec.js
+++ b/test/js/algorithms/sorting/shell-sort.spec.js
@@ -2,4 +2,3 @@ import { shellSort } from '../../../../src/js/index';
 import { testSortAlgorithm } from './sort-algorithm-tests';
 
 testSortAlgorithm(shellSort, 'Shell Sort');
-
diff --git a/test/js/data-structures/deque.spec.js b/test/js/data-structures/deque.spec.js
index 69861377..49ab2dfa 100644
--- a/test/js/data-structures/deque.spec.js
+++ b/test/js/data-structures/deque.spec.js
@@ -191,6 +191,7 @@ describe('Deque', () => {
         this.el1 = el1;
         this.el2 = el2;
       }
+
       toString() {
         return `${this.el1.toString()}|${this.el2.toString()}`;
       }
diff --git a/test/js/data-structures/my-obj.js b/test/js/data-structures/my-obj.js
index a4d2f5f3..ed407894 100644
--- a/test/js/data-structures/my-obj.js
+++ b/test/js/data-structures/my-obj.js
@@ -3,6 +3,7 @@ export default class MyObj {
     this.el1 = el1;
     this.el2 = el2;
   }
+
   toString() {
     return `${this.el1.toString()}|${this.el2.toString()}`;
   }
diff --git a/test/js/data-structures/queue.spec.js b/test/js/data-structures/queue.spec.js
index ec113683..84587bc1 100644
--- a/test/js/data-structures/queue.spec.js
+++ b/test/js/data-structures/queue.spec.js
@@ -155,6 +155,7 @@ describe('Queue', () => {
         this.el1 = el1;
         this.el2 = el2;
       }
+
       toString() {
         return `${this.el1.toString()}|${this.el2.toString()}`;
       }
diff --git a/test/js/data-structures/stack-array.spec.js b/test/js/data-structures/stack-array.spec.js
index 615fca68..0f5912ca 100644
--- a/test/js/data-structures/stack-array.spec.js
+++ b/test/js/data-structures/stack-array.spec.js
@@ -165,6 +165,7 @@ describe('StackArray', () => {
         this.el1 = el1;
         this.el2 = el2;
       }
+
       toString() {
         return `${this.el1.toString()}|${this.el2.toString()}`;
       }
diff --git a/test/js/data-structures/stack.spec.js b/test/js/data-structures/stack.spec.js
index 7c77703b..55361a8a 100644
--- a/test/js/data-structures/stack.spec.js
+++ b/test/js/data-structures/stack.spec.js
@@ -148,6 +148,7 @@ describe('Stack', () => {
         this.el1 = el1;
         this.el2 = el2;
       }
+
       toString() {
         return `${this.el1.toString()}|${this.el2.toString()}`;
       }
diff --git a/test/js/others/factorial.spec.js b/test/js/others/factorial.spec.js
index 975f6404..69341a7a 100644
--- a/test/js/others/factorial.spec.js
+++ b/test/js/others/factorial.spec.js
@@ -1,6 +1,6 @@
 import 'mocha';
 import { expect } from 'chai';
-import { factorialIterative, factorial } from './../../../src/js/others/factorial';
+import { factorialIterative, factorial } from '../../../src/js/others/factorial';
 
 describe('Factorial', () => {
   it('Iterative Factorial', () => {
diff --git a/test/ts/algorithms/graph/breadth-first-search.spec.ts b/test/ts/algorithms/graph/breadth-first-search.spec.ts
index e528ea54..db5f929f 100644
--- a/test/ts/algorithms/graph/breadth-first-search.spec.ts
+++ b/test/ts/algorithms/graph/breadth-first-search.spec.ts
@@ -1,10 +1,10 @@
 import 'mocha';
 import { expect } from 'chai';
-import { BFS, breadthFirstSearch, Graph, Stack } from '../../../../src/ts/index';
+import { BFS, breadthFirstSearch, Graph } from '../../../../src/ts';
 
 describe('Breadth First Search', () => {
 
-  let count;
+  let count: number;
   const vertices = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I'];
   let graph: Graph;
 
@@ -32,7 +32,7 @@ describe('Breadth First Search', () => {
     breadthFirstSearch(graph, vertices[0], assertCallback);
   });
 
-  function assertCallback(value) {
+  function assertCallback(value: string) {
     expect(value).to.equal(vertices[count]);
     count++;
   }
diff --git a/test/ts/algorithms/graph/depth-first-search.spec.ts b/test/ts/algorithms/graph/depth-first-search.spec.ts
index 60e2921c..763284a7 100644
--- a/test/ts/algorithms/graph/depth-first-search.spec.ts
+++ b/test/ts/algorithms/graph/depth-first-search.spec.ts
@@ -3,7 +3,7 @@ import { expect } from 'chai';
 import { DFS, depthFirstSearch, Graph } from '../../../../src/ts/index';
 
 describe('Depth First Search', () => {
-  let count;
+  let count: number;
   const vertices = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I'];
   const dfsCallBack = ['A', 'B', 'E', 'I', 'F', 'C', 'D', 'G', 'H'];
   let graph: Graph;
@@ -32,7 +32,7 @@ describe('Depth First Search', () => {
     depthFirstSearch(graph, assertCallback);
   });
 
-  function assertCallback(value) {
+  function assertCallback(value: string) {
     expect(value).to.equal(dfsCallBack[count]);
     count++;
   }
diff --git a/test/ts/algorithms/math/primality-test.spec.ts b/test/ts/algorithms/math/primality-test.spec.ts
index b62610df..36680623 100644
--- a/test/ts/algorithms/math/primality-test.spec.ts
+++ b/test/ts/algorithms/math/primality-test.spec.ts
@@ -16,7 +16,7 @@ describe('Primality Tests', () => {
     testIsPrime(isPrime2);
   });
 
-  function testIsPrime(primeFunction) {
+  function testIsPrime(primeFunction: Function) {
     expect(primeFunction(-1)).to.equal(false);
     expect(primeFunction(0)).to.equal(false);
     expect(primeFunction(1)).to.equal(false);
diff --git a/test/ts/data-structures/red-black-tree.spec.ts b/test/ts/data-structures/red-black-tree.spec.ts
index 8fefc0f5..d5091f86 100644
--- a/test/ts/data-structures/red-black-tree.spec.ts
+++ b/test/ts/data-structures/red-black-tree.spec.ts
@@ -2,6 +2,7 @@ import { Colors } from './../../../src/ts/data-structures/models/red-black-node'
 import 'mocha';
 import { expect } from 'chai';
 import { RedBlackTree } from '../../../src/ts/index';
+import { RedBlackNode } from '../../../src/ts/data-structures/models/red-black-node';
 
 describe('RedBlackTree', () => {
   let tree: RedBlackTree<number>;
@@ -105,7 +106,7 @@ describe('RedBlackTree', () => {
 
   });
 
-  function assertNode(node, key, color) {
+  function assertNode(node: RedBlackNode<number>, key: number, color: Colors) {
     expect(node.color).to.equal(color);
     expect(node.key).to.equal(key);
   }