.gitattributes

@@ -0,0 +1,40 @@
+# Handle line endings automatically for files detected as text
+# and leave all files detected as binary untouched.
+* text=auto
+
+#
+# The above will handle all files NOT found below
+#
+# These files are text and should be normalized (Convert crlf => lf)
+*.css           eol=lf
+*.df            eol=lf
+*.htm           eol=lf
+*.html          eol=lf
+*.java          eol=lf
+*.js            eol=lf
+*.json          eol=lf
+*.jsp           eol=lf
+*.jspf          eol=lf
+*.jspx          eol=lf
+*.properties    eol=lf
+*.sh            eol=lf
+*.tld           eol=lf
+*.txt           eol=lf
+*.tag           eol=lf
+*.tagx          eol=lf
+*.xml           eol=lf
+*.yml           eol=lf
+
+# These files are binary and should be left untouched
+# (binary is a macro for -text -diff)
+*.class         binary
+*.dll           binary
+*.ear           binary
+*.gif           binary
+*.ico           binary
+*.jar           binary
+*.jpg           binary
+*.jpeg          binary
+*.png           binary
+*.so            binary
+*.war           binary

.github/workflows/build.yml

@@ -0,0 +1,27 @@
+# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs
+
+name: Node.js CI
+
+on:
+  push:
+    branches: [ "fourth-edition" ]
+  pull_request:
+    branches: [ "fourth-edition" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20.x, 22.x]
+    steps:
+    - uses: actions/checkout@v4
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+    - run: npm test

README.md

@@ -98,7 +98,7 @@ Book link - second edition:
  - [Brazilian Portuguese version](https://novatec.com.br/livros/estruturas-de-dados-algoritmos-em-javascript/)
 
  Book link - third edition:
- - [Packt](https://www.packtpub.com/web-development/learning-javascript-data-structures-and-algorithms-third-edition)
+ - [Packt](https://www.packtpub.com/en-us/product/learning-javascript-data-structures-and-algorithms-9781788624947)
  - [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/)

examples/chapter01_02/04-TruthyFalsy.js

@@ -24,4 +24,4 @@ testTruthy({}); // true (object is always true)
 var obj = { name: 'John' };
 testTruthy(obj); // true
 testTruthy(obj.name); // true
-testTruthy(obj.age); // age (property does not exist)
+testTruthy(obj.age); // false (property age does not exist)

examples/chapter09/04-Fibonacci.js

@@ -30,7 +30,7 @@ function fibonacciMemoization(n) {
   const memo = [0, 1];
   const fibonacci = (n) => {
     if (memo[n] != null) return memo[n];
-    return memo[n] = fibonacci(n - 1, memo) + fibonacci(n - 2, memo);
+    return memo[n] = fibonacci(n - 1) + fibonacci(n - 2);
   };
   return fibonacci(n);
 }