diff --git a/examples/PacktDataStructuresAlgorithms.min.js b/examples/PacktDataStructuresAlgorithms.min.js
index b06c53f5..c4644f16 100644
--- a/examples/PacktDataStructuresAlgorithms.min.js
+++ b/examples/PacktDataStructuresAlgorithms.min.js
@@ -1 +1,2 @@
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function defaultCompare(a, b) {\n  if (a === b) {\n    return 0;\n  }\n  return a < b ? Compare.LESS_THAN : Compare.BIGGER_THAN;\n}\n\nexport function defaultEquals(a, b) {\n  return a === b;\n}\n\nexport function defaultToString(item) {\n  if (item === null) {\n    return 'NULL';\n  } else if (item === undefined) {\n    return 'UNDEFINED';\n  } else if (typeof item === 'string' || item instanceof String) {\n    return `${item}`;\n  }\n  return item.toString();\n}\n\nexport function swap(array, a, b) {\n  /* const temp = array[a];\n  array[a] = array[b];\n  array[b] = temp; */\n  [array[a], array[b]] = [array[b], array[a]];\n}\nexport function reverseCompare(compareFn) {\n  return (a, b) => compareFn(b, a);\n}\n\nexport function defaultDiff(a, b) {\n  return Number(a) - Number(b);\n}\n","export class ValuePair {\n  constructor(key, value) {\n    this.key = key;\n    this.value = value;\n  }\n  toString() {\n    return `[#${this.key}: ${this.value}]`;\n  }\n}\n","import { defaultEquals } from '../util';\nimport { Node } from './models/linked-list-models';\n\nexport default class LinkedList {\n  constructor(equalsFn = defaultEquals) {\n    this.equalsFn = equalsFn;\n    this.count = 0;\n    this.head = undefined;\n  }\n  push(element) {\n    const node = new Node(element);\n    let current;\n    if (this.head == null) {\n      // catches null && undefined\n      this.head = node;\n    } else {\n      current = this.head;\n      while (current.next != null) {\n        current = current.next;\n      }\n      current.next = node;\n    }\n    this.count++;\n  }\n  getElementAt(index) {\n    if (index >= 0 && index <= this.count) {\n      let node = this.head;\n      for (let i = 0; i < index && node != null; i++) {\n        node = node.next;\n      }\n      return node;\n    }\n    return undefined;\n  }\n  insert(element, index) {\n    if (index >= 0 && index <= this.count) {\n      const node = new Node(element);\n      if (index === 0) {\n        const current = this.head;\n        node.next = current;\n        this.head = node;\n      } else {\n        const previous = this.getElementAt(index - 1);\n        node.next = previous.next;\n        previous.next = node;\n      }\n      this.count++;\n      return true;\n    }\n    return false;\n  }\n  removeAt(index) {\n    if (index >= 0 && index < this.count) {\n      let current = this.head;\n      if (index === 0) {\n        this.head = current.next;\n      } else {\n        const previous = this.getElementAt(index - 1);\n        current = previous.next;\n        previous.next = current.next;\n      }\n      this.count--;\n      return current.element;\n    }\n    return undefined;\n  }\n  remove(element) {\n    const index = this.indexOf(element);\n    return this.removeAt(index);\n  }\n  indexOf(element) {\n    let current = this.head;\n    for (let i = 0; i < this.size() && current != null; i++) {\n      if (this.equalsFn(element, current.element)) {\n        return i;\n      }\n      current = current.next;\n    }\n    return -1;\n  }\n  isEmpty() {\n    return this.size() === 0;\n  }\n  size() {\n    return this.count;\n  }\n  getHead() {\n    return this.head;\n  }\n  clear() {\n    this.head = undefined;\n    this.count = 0;\n  }\n  toString() {\n    if (this.head == null) {\n      return '';\n    }\n    let objString = `${this.head.element}`;\n    let current = this.head.next;\n    for (let i = 1; i < this.size() && current != null; i++) {\n      objString = `${objString},${current.element}`;\n      current = current.next;\n    }\n    return objString;\n  }\n}\n","// @ts-check\n\nexport default class Stack {\n  constructor() {\n    this.count = 0;\n    this.items = {};\n  }\n  push(element) {\n    this.items[this.count] = element;\n    this.count++;\n  }\n  pop() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    this.count--;\n    const result = this.items[this.count];\n    delete this.items[this.count];\n    return result;\n  }\n  peek() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    return this.items[this.count - 1];\n  }\n  isEmpty() {\n    return this.count === 0;\n  }\n  size() {\n    return this.count;\n  }\n  clear() {\n    /* while (!this.isEmpty()) {\n        this.pop();\n      } */\n    this.items = {};\n    this.count = 0;\n  }\n  toString() {\n    if (this.isEmpty()) {\n      return '';\n    }\n    let objString = `${this.items[0]}`;\n    for (let i = 1; i < this.count; i++) {\n      objString = `${objString},${this.items[i]}`;\n    }\n    return objString;\n  }\n}\n","import { defaultCompare, Compare } from '../../util';\n\nexport function findMaxValue(array, compareFn = defaultCompare) {\n  if (array && array.length > 0) {\n    let max = array[0];\n    for (let i = 1; i < array.length; i++) {\n      if (compareFn(max, array[i]) === Compare.LESS_THAN) {\n        max = array[i];\n      }\n    }\n    return max;\n  }\n  return undefined;\n}\nexport function findMinValue(array, compareFn = defaultCompare) {\n  if (array && array.length > 0) {\n    let min = array[0];\n    for (let i = 1; i < array.length; i++) {\n      if (compareFn(min, array[i]) === Compare.BIGGER_THAN) {\n        min = array[i];\n      }\n    }\n    return min;\n  }\n  return undefined;\n}\n","export class Node {\n  constructor(element, next) {\n    this.element = element;\n    this.next = next;\n  }\n}\nexport class DoublyNode extends Node {\n  constructor(element, next, prev) {\n    super(element, next);\n    this.prev = prev;\n  }\n}\n","// @ts-check\n\nexport default class Queue {\n  constructor() {\n    this.count = 0;\n    this.lowestCount = 0;\n    this.items = {};\n  }\n\n  enqueue(element) {\n    this.items[this.count] = element;\n    this.count++;\n  }\n\n  dequeue() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    const result = this.items[this.lowestCount];\n    delete this.items[this.lowestCount];\n    this.lowestCount++;\n    return result;\n  }\n\n  peek() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    return this.items[this.lowestCount];\n  }\n\n  isEmpty() {\n    return this.size() === 0;\n  }\n\n  clear() {\n    this.items = {};\n    this.count = 0;\n    this.lowestCount = 0;\n  }\n\n  size() {\n    return this.count - this.lowestCount;\n  }\n\n  toString() {\n    if (this.isEmpty()) {\n      return '';\n    }\n    let objString = `${this.items[this.lowestCount]}`;\n    for (let i = this.lowestCount + 1; i < this.count; i++) {\n      objString = `${objString},${this.items[i]}`;\n    }\n    return objString;\n  }\n}\n","import { Compare, defaultCompare, swap } from '../../util';\n\nfunction partition(array, left, right, compareFn) {\n  const pivot = array[Math.floor((right + left) / 2)];\n  let i = left;\n  let j = right;\n  // console.log('pivot is ' + pivot + '; left is ' + left + '; right is ' + right);\n  while (i <= j) {\n    while (compareFn(array[i], pivot) === Compare.LESS_THAN) {\n      i++;\n      // console.log('i = ' + i);\n    }\n    while (compareFn(array[j], pivot) === Compare.BIGGER_THAN) {\n      j--;\n      // console.log('j = ' + j);\n    }\n    if (i <= j) {\n      // console.log('swap ' + array[i] + ' with ' + array[j]);\n      swap(array, i, j);\n      i++;\n      j--;\n    }\n  }\n  return i;\n}\nfunction quick(array, left, right, compareFn) {\n  let index;\n  if (array.length > 1) {\n    index = partition(array, left, right, compareFn);\n    if (left < index - 1) {\n      quick(array, left, index - 1, compareFn);\n    }\n    if (index < right) {\n      quick(array, index, right, compareFn);\n    }\n  }\n  return array;\n}\nexport function quickSort(array, compareFn = defaultCompare) {\n  return quick(array, 0, array.length - 1, compareFn);\n}\n","import { Compare, defaultCompare } from '../../util';\n\nexport const insertionSort = (array, compareFn = defaultCompare) => {\n  const { length } = array;\n  let temp;\n  for (let i = 1; i < length; i++) {\n    let j = i;\n    temp = array[i];\n    // console.log('to be inserted ' + temp);\n    while (j > 0 && compareFn(array[j - 1], temp) === Compare.BIGGER_THAN) {\n      // console.log('shift ' + array[j - 1]);\n      array[j] = array[j - 1];\n      j--;\n    }\n    // console.log('insert ' + temp);\n    array[j] = temp;\n  }\n  return array;\n};\n","export class Node {\n  constructor(key) {\n    this.key = key;\n    this.left = null;\n    this.right = null;\n  }\n  toString() {\n    return `${this.key}`;\n  }\n}\n","import { Compare, defaultCompare } from '../util';\nimport { Node } from './models/node';\n\nexport default class BinarySearchTree {\n  constructor(compareFn = defaultCompare) {\n    this.compareFn = compareFn;\n    this.root = null;\n  }\n  insert(key) {\n    // special case: first key\n    if (this.root == null) {\n      this.root = new Node(key);\n    } else {\n      this.insertNode(this.root, key);\n    }\n  }\n  insertNode(node, key) {\n    if (this.compareFn(key, node.key) === Compare.LESS_THAN) {\n      if (node.left == null) {\n        node.left = new Node(key);\n      } else {\n        this.insertNode(node.left, key);\n      }\n    } else if (node.right == null) {\n      node.right = new Node(key);\n    } else {\n      this.insertNode(node.right, key);\n    }\n  }\n  getRoot() {\n    return this.root;\n  }\n  search(key) {\n    return this.searchNode(this.root, key);\n  }\n  searchNode(node, key) {\n    if (node == null) {\n      return false;\n    }\n    if (this.compareFn(key, node.key) === Compare.LESS_THAN) {\n      return this.searchNode(node.left, key);\n    } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {\n      return this.searchNode(node.right, key);\n    }\n    return true;\n  }\n  inOrderTraverse(callback) {\n    this.inOrderTraverseNode(this.root, callback);\n  }\n  inOrderTraverseNode(node, callback) {\n    if (node != null) {\n      this.inOrderTraverseNode(node.left, callback);\n      callback(node.key);\n      this.inOrderTraverseNode(node.right, callback);\n    }\n  }\n  preOrderTraverse(callback) {\n    this.preOrderTraverseNode(this.root, callback);\n  }\n  preOrderTraverseNode(node, callback) {\n    if (node != null) {\n      callback(node.key);\n      this.preOrderTraverseNode(node.left, callback);\n      this.preOrderTraverseNode(node.right, callback);\n    }\n  }\n  postOrderTraverse(callback) {\n    this.postOrderTraverseNode(this.root, callback);\n  }\n  postOrderTraverseNode(node, callback) {\n    if (node != null) {\n      this.postOrderTraverseNode(node.left, callback);\n      this.postOrderTraverseNode(node.right, callback);\n      callback(node.key);\n    }\n  }\n  min() {\n    return this.minNode(this.root);\n  }\n  minNode(node) {\n    let current = node;\n    while (current != null && current.left != null) {\n      current = current.left;\n    }\n    return current;\n  }\n  max() {\n    return this.maxNode(this.root);\n  }\n  maxNode(node) {\n    let current = node;\n    while (current != null && current.right != null) {\n      current = current.right;\n    }\n    return current;\n  }\n  remove(key) {\n    this.root = this.removeNode(this.root, key);\n  }\n  removeNode(node, key) {\n    if (node == null) {\n      return null;\n    }\n    if (this.compareFn(key, node.key) === Compare.LESS_THAN) {\n      node.left = this.removeNode(node.left, key);\n      return node;\n    } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {\n      node.right = this.removeNode(node.right, key);\n      return node;\n    }\n    // key is equal to node.item\n    // handle 3 special conditions\n    // 1 - a leaf node\n    // 2 - a node with only 1 child\n    // 3 - a node with 2 children\n    // case 1\n    if (node.left == null && node.right == null) {\n      node = null;\n      return node;\n    }\n    // case 2\n    if (node.left == null) {\n      node = node.right;\n      return node;\n    } else if (node.right == null) {\n      node = node.left;\n      return node;\n    }\n    // case 3\n    const aux = this.minNode(node.right);\n    node.key = aux.key;\n    node.right = this.removeNode(node.right, aux.key);\n    return node;\n  }\n}\n","import { defaultToString } from '../util';\nimport { ValuePair } from './models/value-pair';\n\nexport default class Dictionary {\n  constructor(toStrFn = defaultToString) {\n    this.toStrFn = toStrFn;\n    this.table = {};\n  }\n  set(key, value) {\n    if (key != null && value != null) {\n      const tableKey = this.toStrFn(key);\n      this.table[tableKey] = new ValuePair(key, value);\n      return true;\n    }\n    return false;\n  }\n  get(key) {\n    const valuePair = this.table[this.toStrFn(key)];\n    return valuePair == null ? undefined : valuePair.value;\n  }\n  hasKey(key) {\n    return this.table[this.toStrFn(key)] != null;\n  }\n  remove(key) {\n    if (this.hasKey(key)) {\n      delete this.table[this.toStrFn(key)];\n      return true;\n    }\n    return false;\n  }\n  values() {\n    return this.keyValues().map(valuePair => valuePair.value);\n  }\n  keys() {\n    return this.keyValues().map(valuePair => valuePair.key);\n  }\n  keyValues() {\n    return Object.values(this.table);\n  }\n  forEach(callbackFn) {\n    const valuePairs = this.keyValues();\n    for (let i = 0; i < valuePairs.length; i++) {\n      const result = callbackFn(valuePairs[i].key, valuePairs[i].value);\n      if (result === false) {\n        break;\n      }\n    }\n  }\n  isEmpty() {\n    return this.size() === 0;\n  }\n  size() {\n    return Object.keys(this.table).length;\n  }\n  clear() {\n    this.table = {};\n  }\n  toString() {\n    if (this.isEmpty()) {\n      return '';\n    }\n    const valuePairs = this.keyValues();\n    let objString = `${valuePairs[0].toString()}`;\n    for (let i = 1; i < valuePairs.length; i++) {\n      objString = `${objString},${valuePairs[i].toString()}`;\n    }\n    return objString;\n  }\n}\n","import { defaultEquals } from '../util';\nimport LinkedList from './linked-list';\nimport { DoublyNode } from './models/linked-list-models';\n\nexport default class DoublyLinkedList extends LinkedList {\n  constructor(equalsFn = defaultEquals) {\n    super(equalsFn);\n    this.tail = undefined;\n  }\n  push(element) {\n    const node = new DoublyNode(element);\n    if (this.head == null) {\n      this.head = node;\n      this.tail = node; // NEW\n    } else {\n      // attach to the tail node // NEW\n      this.tail.next = node;\n      node.prev = this.tail;\n      this.tail = node;\n    }\n    this.count++;\n  }\n  insert(element, index) {\n    if (index >= 0 && index <= this.count) {\n      const node = new DoublyNode(element);\n      let current = this.head;\n      if (index === 0) {\n        if (this.head == null) { // NEW\n          this.head = node;\n          this.tail = node; // NEW\n        } else {\n          node.next = this.head;\n          this.head.prev = node; // NEW\n          this.head = node;\n        }\n      } else if (index === this.count) { // last item NEW\n        current = this.tail;\n        current.next = node;\n        node.prev = current;\n        this.tail = node;\n      } else {\n        const previous = this.getElementAt(index - 1);\n        current = previous.next;\n        node.next = current;\n        previous.next = node;\n        current.prev = node; // NEW\n        node.prev = previous; // NEW\n      }\n      this.count++;\n      return true;\n    }\n    return false;\n  }\n  removeAt(index) {\n    if (index >= 0 && index < this.count) {\n      let current = this.head;\n      if (index === 0) {\n        this.head = this.head.next;\n        // if there is only one item, then we update tail as well //NEW\n        if (this.count === 1) {\n          // {2}\n          this.tail = undefined;\n        } else {\n          this.head.prev = undefined;\n        }\n      } else if (index === this.count - 1) {\n        // last item //NEW\n        current = this.tail;\n        this.tail = current.prev;\n        this.tail.next = undefined;\n      } else {\n        current = this.getElementAt(index);\n        const previous = current.prev;\n        // link previous with current's next - skip it to remove\n        previous.next = current.next;\n        current.next.prev = previous; // NEW\n      }\n      this.count--;\n      return current.element;\n    }\n    return undefined;\n  }\n  indexOf(element) {\n    let current = this.head;\n    let index = 0;\n    while (current != null) {\n      if (this.equalsFn(element, current.element)) {\n        return index;\n      }\n      index++;\n      current = current.next;\n    }\n    return -1;\n  }\n  getHead() {\n    return this.head;\n  }\n  getTail() {\n    return this.tail;\n  }\n  clear() {\n    super.clear();\n    this.tail = undefined;\n  }\n  toString() {\n    if (this.head == null) {\n      return '';\n    }\n    let objString = `${this.head.element}`;\n    let current = this.head.next;\n    while (current != null) {\n      objString = `${objString},${current.element}`;\n      current = current.next;\n    }\n    return objString;\n  }\n  inverseToString() {\n    if (this.tail == null) {\n      return '';\n    }\n    let objString = `${this.tail.element}`;\n    let previous = this.tail.prev;\n    while (previous != null) {\n      objString = `${objString},${previous.element}`;\n      previous = previous.prev;\n    }\n    return objString;\n  }\n}\n","// @ts-check\n\nexport default class Deque {\n  constructor() {\n    this.count = 0;\n    this.lowestCount = 0;\n    this.items = {};\n  }\n\n  addFront(element) {\n    if (this.isEmpty()) {\n      this.addBack(element);\n    } else if (this.lowestCount > 0) {\n      this.lowestCount--;\n      this.items[this.lowestCount] = element;\n    } else {\n      for (let i = this.count; i > 0; i--) {\n        this.items[i] = this.items[i - 1];\n      }\n      this.count++;\n      this.items[0] = element;\n    }\n  }\n\n  addBack(element) {\n    this.items[this.count] = element;\n    this.count++;\n  }\n\n  removeFront() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    const result = this.items[this.lowestCount];\n    delete this.items[this.lowestCount];\n    this.lowestCount++;\n    return result;\n  }\n\n  removeBack() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    this.count--;\n    const result = this.items[this.count];\n    delete this.items[this.count];\n    return result;\n  }\n\n  peekFront() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    return this.items[this.lowestCount];\n  }\n\n  peekBack() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    return this.items[this.count - 1];\n  }\n\n  isEmpty() {\n    return this.size() === 0;\n  }\n\n  clear() {\n    this.items = {};\n    this.count = 0;\n    this.lowestCount = 0;\n  }\n\n  size() {\n    return this.count - this.lowestCount;\n  }\n\n  toString() {\n    if (this.isEmpty()) {\n      return '';\n    }\n    let objString = `${this.items[this.lowestCount]}`;\n    for (let i = this.lowestCount + 1; i < this.count; i++) {\n      objString = `${objString},${this.items[i]}`;\n    }\n    return objString;\n  }\n}\n","import { Compare, defaultCompare } from '../util';\nimport BinarySearchTree from './binary-search-tree';\nimport { Node } from './models/node';\n\nconst BalanceFactor = {\n  UNBALANCED_RIGHT: 1,\n  SLIGHTLY_UNBALANCED_RIGHT: 2,\n  BALANCED: 3,\n  SLIGHTLY_UNBALANCED_LEFT: 4,\n  UNBALANCED_LEFT: 5\n};\n\nexport default class AVLTree extends BinarySearchTree {\n  constructor(compareFn = defaultCompare) {\n    super(compareFn);\n    this.compareFn = compareFn;\n    this.root = null;\n  }\n  getNodeHeight(node) {\n    if (node == null) {\n      return -1;\n    }\n    return Math.max(this.getNodeHeight(node.left), this.getNodeHeight(node.right)) + 1;\n  }\n  /**\n   * Left left case: rotate right\n   *\n   *       b                           a\n   *      / \\                         / \\\n   *     a   e -> rotationLL(b) ->   c   b\n   *    / \\                             / \\\n   *   c   d                           d   e\n   *\n   * @param node Node<T>\n   */\n  rotationLL(node) {\n    const tmp = node.left;\n    node.left = tmp.right;\n    tmp.right = node;\n    return tmp;\n  }\n  /**\n   * Right right case: rotate left\n   *\n   *     a                              b\n   *    / \\                            / \\\n   *   c   b   -> rotationRR(a) ->    a   e\n   *      / \\                        / \\\n   *     d   e                      c   d\n   *\n   * @param node Node<T>\n   */\n  rotationRR(node) {\n    const tmp = node.right;\n    node.right = tmp.left;\n    tmp.left = node;\n    return tmp;\n  }\n  /**\n   * Left right case: rotate left then right\n   * @param node Node<T>\n   */\n  rotationLR(node) {\n    node.left = this.rotationRR(node.left);\n    return this.rotationLL(node);\n  }\n  /**\n   * Right left case: rotate right then left\n   * @param node Node<T>\n   */\n  rotationRL(node) {\n    node.right = this.rotationLL(node.right);\n    return this.rotationRR(node);\n  }\n  getBalanceFactor(node) {\n    const heightDifference = this.getNodeHeight(node.left) - this.getNodeHeight(node.right);\n    switch (heightDifference) {\n      case -2:\n        return BalanceFactor.UNBALANCED_RIGHT;\n      case -1:\n        return BalanceFactor.SLIGHTLY_UNBALANCED_RIGHT;\n      case 1:\n        return BalanceFactor.SLIGHTLY_UNBALANCED_LEFT;\n      case 2:\n        return BalanceFactor.UNBALANCED_LEFT;\n      default:\n        return BalanceFactor.BALANCED;\n    }\n  }\n  insert(key) {\n    this.root = this.insertNode(this.root, key);\n  }\n  insertNode(node, key) {\n    if (node == null) {\n      return new Node(key);\n    } else if (this.compareFn(key, node.key) === Compare.LESS_THAN) {\n      node.left = this.insertNode(node.left, key);\n    } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {\n      node.right = this.insertNode(node.right, key);\n    } else {\n      return node; // duplicated key\n    }\n    // verify if tree is balanced\n    const balanceFactor = this.getBalanceFactor(node);\n    if (balanceFactor === BalanceFactor.UNBALANCED_LEFT) {\n      if (this.compareFn(key, node.left.key) === Compare.LESS_THAN) {\n        // Left left case\n        node = this.rotationLL(node);\n      } else {\n        // Left right case\n        return this.rotationLR(node);\n      }\n    }\n    if (balanceFactor === BalanceFactor.UNBALANCED_RIGHT) {\n      if (this.compareFn(key, node.right.key) === Compare.BIGGER_THAN) {\n        // Right right case\n        node = this.rotationRR(node);\n      } else {\n        // Right left case\n        return this.rotationRL(node);\n      }\n    }\n    return node;\n  }\n  removeNode(node, key) {\n    node = super.removeNode(node, key); // {1}\n    if (node == null) {\n      return node;\n    }\n    // verify if tree is balanced\n    const balanceFactor = this.getBalanceFactor(node);\n    if (balanceFactor === BalanceFactor.UNBALANCED_LEFT) {\n      // Left left case\n      if (\n        this.getBalanceFactor(node.left) === BalanceFactor.BALANCED ||\n        this.getBalanceFactor(node.left) === BalanceFactor.SLIGHTLY_UNBALANCED_LEFT\n      ) {\n        return this.rotationLL(node);\n      }\n      // Left right case\n      if (this.getBalanceFactor(node.left) === BalanceFactor.SLIGHTLY_UNBALANCED_RIGHT) {\n        return this.rotationLR(node.left);\n      }\n    }\n    if (balanceFactor === BalanceFactor.UNBALANCED_RIGHT) {\n      // Right right case\n      if (\n        this.getBalanceFactor(node.right) === BalanceFactor.BALANCED ||\n        this.getBalanceFactor(node.right) === BalanceFactor.SLIGHTLY_UNBALANCED_RIGHT\n      ) {\n        return this.rotationRR(node);\n      }\n      // Right left case\n      if (this.getBalanceFactor(node.right) === BalanceFactor.SLIGHTLY_UNBALANCED_LEFT) {\n        return this.rotationRL(node.right);\n      }\n    }\n    return node;\n  }\n}\n","import { defaultEquals, DOES_NOT_EXIST } from '../../util';\n\nexport function sequentialSearch(array, value, equalsFn = defaultEquals) {\n  for (let i = 0; i < array.length; i++) {\n    if (equalsFn(value, array[i])) {\n      return i;\n    }\n  }\n  return DOES_NOT_EXIST;\n}\n","import {\n  biggerEquals,\n  Compare,\n  defaultCompare,\n  defaultEquals,\n  defaultDiff,\n  DOES_NOT_EXIST,\n  lesserEquals\n} from '../../util';\n\nexport function interpolationSearch(\n  array,\n  value,\n  compareFn = defaultCompare,\n  equalsFn = defaultEquals,\n  diffFn = defaultDiff\n) {\n  const { length } = array;\n  let low = 0;\n  let high = length - 1;\n  let position = -1;\n  let delta = -1;\n  while (\n    low <= high &&\n    biggerEquals(value, array[low], compareFn) &&\n    lesserEquals(value, array[high], compareFn)\n  ) {\n    delta = diffFn(value, array[low]) / diffFn(array[high], array[low]);\n    position = low + Math.floor((high - low) * delta);\n    if (equalsFn(array[position], value)) {\n      return position;\n    }\n    if (compareFn(array[position], value) === Compare.LESS_THAN) {\n      low = position + 1;\n    } else {\n      high = position - 1;\n    }\n  }\n  return DOES_NOT_EXIST;\n}\n","import { Compare, defaultCompare, DOES_NOT_EXIST } from '../../util';\nimport { quickSort } from '../sorting/quicksort';\n\nexport function binarySearch(array, value, compareFn = defaultCompare) {\n  const sortedArray = quickSort(array);\n  let low = 0;\n  let high = sortedArray.length - 1;\n  while (low <= high) {\n    const mid = Math.floor((low + high) / 2);\n    const element = sortedArray[mid];\n    // console.log('mid element is ' + element);\n    if (compareFn(element, value) === Compare.LESS_THAN) {\n      low = mid + 1;\n      // console.log('low is ' + low);\n    } else if (compareFn(element, value) === Compare.BIGGER_THAN) {\n      high = mid - 1;\n      // console.log('high is ' + high);\n    } else {\n      // console.log('found it');\n      return mid;\n    }\n  }\n  return DOES_NOT_EXIST;\n}\n","import { Compare, defaultCompare } from '../../util';\n\nexport function shellSort(array, compareFn = defaultCompare) {\n  let increment = array.length / 2;\n  while (increment > 0) {\n    for (let i = increment; i < array.length; i++) {\n      let j = i;\n      const temp = array[i];\n      while (j >= increment && compareFn(array[j - increment], temp) === Compare.BIGGER_THAN) {\n        array[j] = array[j - increment];\n        j -= increment;\n      }\n      array[j] = temp;\n    }\n    if (increment === 2) {\n      increment = 1;\n    } else {\n      increment = Math.floor((increment * 5) / 11);\n    }\n  }\n  return array;\n}\n","import { Compare, defaultCompare, swap } from '../../util';\n\nexport const selectionSort = (array, compareFn = defaultCompare) => {\n  const { length } = array;\n  let indexMin;\n  for (let i = 0; i < length - 1; i++) {\n    indexMin = i;\n    // console.log('index ' + array[i]);\n    for (let j = i; j < length; j++) {\n      if (compareFn(array[indexMin], array[j]) === Compare.BIGGER_THAN) {\n        // console.log('new index min ' + array[j]);\n        indexMin = j;\n      }\n    }\n    if (i !== indexMin) {\n      // console.log('swap ' + array[i] + ' with ' + array[indexMin]);\n      swap(array, i, indexMin);\n    }\n  }\n  return array;\n};\n","import { findMaxValue, findMinValue } from '../search/min-max-search';\n\nconst getBucketIndex = (value, minValue, significantDigit, radixBase) =>\n  Math.floor(((value - minValue) / significantDigit) % radixBase);\n\nconst countingSortForRadix = (array, radixBase, significantDigit, minValue) => {\n  let bucketsIndex;\n  const buckets = [];\n  const aux = [];\n  for (let i = 0; i < radixBase; i++) {\n    buckets[i] = 0;\n  }\n  for (let i = 0; i < array.length; i++) {\n    bucketsIndex = getBucketIndex(array[i], minValue, significantDigit, radixBase);\n    buckets[bucketsIndex]++;\n  }\n  for (let i = 1; i < radixBase; i++) {\n    buckets[i] += buckets[i - 1];\n  }\n  for (let i = array.length - 1; i >= 0; i--) {\n    bucketsIndex = getBucketIndex(array[i], minValue, significantDigit, radixBase);\n    aux[--buckets[bucketsIndex]] = array[i];\n  }\n  for (let i = 0; i < array.length; i++) {\n    array[i] = aux[i];\n  }\n  return array;\n};\nexport function radixSort(array, radixBase = 10) {\n  if (array.length < 2) {\n    return array;\n  }\n  const minValue = findMinValue(array);\n  const maxValue = findMaxValue(array);\n  // Perform counting sort for each significant digit, starting at 1\n  let significantDigit = 1;\n  while ((maxValue - minValue) / significantDigit >= 1) {\n    // console.log('radix sort for digit ' + significantDigit);\n    array = countingSortForRadix(array, radixBase, significantDigit, minValue);\n    // console.log(array.join());\n    significantDigit *= radixBase;\n  }\n  return array;\n}\n","import { Compare, defaultCompare } from '../../util';\n\nfunction merge(left, right, compareFn) {\n  let i = 0;\n  let j = 0;\n  const result = [];\n  while (i < left.length && j < right.length) {\n    result.push(compareFn(left[i], right[j]) === Compare.LESS_THAN ? left[i++] : right[j++]);\n  }\n  return result.concat(i < left.length ? left.slice(i) : right.slice(j));\n}\nexport function mergeSort(array, compareFn = defaultCompare) {\n  if (array.length > 1) {\n    const { length } = array;\n    const middle = Math.floor(length / 2);\n    const left = mergeSort(array.slice(0, middle), compareFn);\n    const right = mergeSort(array.slice(middle, length), compareFn);\n    array = merge(left, right, compareFn);\n  }\n  return array;\n}\n","import { findMaxValue } from '../search/min-max-search';\n\nexport function countingSort(array) {\n  if (array.length < 2) {\n    return array;\n  }\n  const maxValue = findMaxValue(array);\n  let sortedIndex = 0;\n  const counts = new Array(maxValue + 1);\n  array.forEach(element => {\n    if (!counts[element]) {\n      counts[element] = 0;\n    }\n    counts[element]++;\n  });\n  // console.log('Frequencies: ' + counts.join());\n  counts.forEach((element, i) => {\n    while (element > 0) {\n      array[sortedIndex++] = i;\n      element--;\n    }\n  });\n  return array;\n}\n","import { insertionSort } from './insertion-sort';\n\nfunction createBuckets(array, bucketSize) {\n  let minValue = array[0];\n  let maxValue = array[0];\n  for (let i = 1; i < array.length; i++) {\n    if (array[i] < minValue) {\n      minValue = array[i];\n    } else if (array[i] > maxValue) {\n      maxValue = array[i];\n    }\n  }\n  const bucketCount = Math.floor((maxValue - minValue) / bucketSize) + 1;\n  const buckets = [];\n  for (let i = 0; i < bucketCount; i++) {\n    buckets[i] = [];\n  }\n  for (let i = 0; i < array.length; i++) {\n    buckets[Math.floor((array[i] - minValue) / bucketSize)].push(array[i]);\n  }\n  return buckets;\n}\nfunction sortBuckets(buckets) {\n  const sortedArray = [];\n  for (let i = 0; i < buckets.length; i++) {\n    if (buckets[i] != null) {\n      insertionSort(buckets[i]);\n      sortedArray.push(...buckets[i]);\n    }\n  }\n  return sortedArray;\n}\nexport function bucketSort(array, bucketSize = 5) {\n  if (array.length < 2) {\n    return array;\n  }\n  const buckets = createBuckets(array, bucketSize);\n  return sortBuckets(buckets);\n}\n","import { Compare, defaultCompare, swap } from '../../util';\n\nexport function modifiedBubbleSort(array, compareFn = defaultCompare) {\n  const { length } = array;\n  for (let i = 0; i < length; i++) {\n    // console.log('--- ');\n    for (let j = 0; j < length - 1 - i; j++) {\n      // console.log('compare ' + array[j] + ' with ' + array[j + 1]);\n      if (compareFn(array[j], array[j + 1]) === Compare.BIGGER_THAN) {\n        // console.log('swap ' + array[j] + ' with ' + array[j + 1]);\n        swap(array, j, j + 1);\n      }\n    }\n  }\n  return array;\n}\n","import { Compare, defaultCompare, swap } from '../../util';\n\nexport function bubbleSort(array, compareFn = defaultCompare) {\n  const { length } = array;\n  for (let i = 0; i < length; i++) {\n    // console.log('--- ');\n    for (let j = 0; j < length - 1; j++) {\n      // console.log('compare ' + array[j] + ' with ' + array[j + 1]);\n      if (compareFn(array[j], array[j + 1]) === Compare.BIGGER_THAN) {\n        // console.log('swap ' + array[j] + ' with ' + array[j + 1]);\n        swap(array, j, j + 1);\n      }\n    }\n  }\n  return array;\n}\n","import { swap } from '../../util';\n\nexport function shuffle(array) {\n  let currentIndex = array.length;\n  while (currentIndex !== 0) {\n    const randomIndex = Math.floor(Math.random() * currentIndex);\n    currentIndex--;\n    swap(array, currentIndex, randomIndex);\n  }\n  return array;\n}\n","const INF = Number.MAX_SAFE_INTEGER;\nconst find = (i, parent) => {\n  while (parent[i]) {\n    i = parent[i]; // eslint-disable-line prefer-destructuring\n  }\n  return i;\n};\nconst union = (i, j, parent) => {\n  if (i !== j) {\n    parent[j] = i;\n    return true;\n  }\n  return false;\n};\nconst initializeCost = graph => {\n  const cost = [];\n  const { length } = graph;\n  for (let i = 0; i < length; i++) {\n    cost[i] = [];\n    for (let j = 0; j < length; j++) {\n      if (graph[i][j] === 0) {\n        cost[i][j] = INF;\n      } else {\n        cost[i][j] = graph[i][j];\n      }\n    }\n  }\n  return cost;\n};\nexport const kruskal = graph => {\n  const { length } = graph;\n  const parent = [];\n  let ne = 0;\n  let a;\n  let b;\n  let u;\n  let v;\n  const cost = initializeCost(graph);\n  while (ne < length - 1) {\n    for (let i = 0, min = INF; i < length; i++) {\n      for (let j = 0; j < length; j++) {\n        if (cost[i][j] < min) {\n          min = cost[i][j];\n          a = u = i;\n          b = v = j;\n        }\n      }\n    }\n    u = find(u, parent);\n    v = find(v, parent);\n    if (union(u, v, parent)) {\n      ne++;\n    }\n    cost[a][b] = cost[b][a] = INF;\n  }\n  return parent;\n};\n","const INF = Number.MAX_SAFE_INTEGER;\nconst minKey = (graph, key, visited) => {\n  // Initialize min value\n  let min = INF;\n  let minIndex = 0;\n  for (let v = 0; v < graph.length; v++) {\n    if (visited[v] === false && key[v] < min) {\n      min = key[v];\n      minIndex = v;\n    }\n  }\n  return minIndex;\n};\nexport const prim = graph => {\n  const parent = [];\n  const key = [];\n  const visited = [];\n  const { length } = graph;\n  for (let i = 0; i < length; i++) {\n    key[i] = INF;\n    visited[i] = false;\n  }\n  key[0] = 0;\n  parent[0] = -1;\n  for (let i = 0; i < length - 1; i++) {\n    const u = minKey(graph, key, visited);\n    visited[u] = true;\n    for (let v = 0; v < length; v++) {\n      if (graph[u][v] && !visited[v] && graph[u][v] < key[v]) {\n        parent[v] = u;\n        key[v] = graph[u][v];\n      }\n    }\n  }\n  return parent;\n};\n","export const floydWarshall = graph => {\n  const dist = [];\n  const { length } = graph;\n  for (let i = 0; i < length; i++) {\n    dist[i] = [];\n    for (let j = 0; j < length; j++) {\n      if (i === j) {\n        dist[i][j] = 0;\n      } else if (!isFinite(graph[i][j])) {\n        dist[i][j] = Infinity;\n      } else {\n        dist[i][j] = graph[i][j];\n      }\n    }\n  }\n  for (let k = 0; k < length; k++) {\n    for (let i = 0; i < length; i++) {\n      for (let j = 0; j < length; j++) {\n        if (dist[i][k] + dist[k][j] < dist[i][j]) {\n          dist[i][j] = dist[i][k] + dist[k][j];\n        }\n      }\n    }\n  }\n  return dist;\n};\n","const INF = Number.MAX_SAFE_INTEGER;\nconst minDistance = (dist, visited) => {\n  let min = INF;\n  let minIndex = -1;\n  for (let v = 0; v < dist.length; v++) {\n    if (visited[v] === false && dist[v] <= min) {\n      min = dist[v];\n      minIndex = v;\n    }\n  }\n  return minIndex;\n};\nexport const dijkstra = (graph, src) => {\n  const dist = [];\n  const visited = [];\n  const { length } = graph;\n  for (let i = 0; i < length; i++) {\n    dist[i] = INF;\n    visited[i] = false;\n  }\n  dist[src] = 0;\n  for (let i = 0; i < length - 1; i++) {\n    const u = minDistance(dist, visited);\n    visited[u] = true;\n    for (let v = 0; v < length; v++) {\n      if (!visited[v] && graph[u][v] !== 0 && dist[u] !== INF && dist[u] + graph[u][v] < dist[v]) {\n        dist[v] = dist[u] + graph[u][v];\n      }\n    }\n  }\n  return dist;\n};\n","// import Graph from '../../data-structures/graph';\n\nconst Colors = {\n  WHITE: 0,\n  GREY: 1,\n  BLACK: 2\n};\n\nconst initializeColor = vertices => {\n  const color = {};\n  for (let i = 0; i < vertices.length; i++) {\n    color[vertices[i]] = Colors.WHITE;\n  }\n  return color;\n};\n\nconst depthFirstSearchVisit = (u, color, adjList, callback) => {\n  color[u] = Colors.GREY;\n  if (callback) {\n    callback(u);\n  }\n  // console.log('Discovered ' + u);\n  const neighbors = adjList.get(u);\n  for (let i = 0; i < neighbors.length; i++) {\n    const w = neighbors[i];\n    if (color[w] === Colors.WHITE) {\n      depthFirstSearchVisit(w, color, adjList, callback);\n    }\n  }\n  color[u] = Colors.BLACK;\n  // console.log('explored ' + u);\n};\n\nexport const depthFirstSearch = (graph, callback) => {\n  const vertices = graph.getVertices();\n  const adjList = graph.getAdjList();\n  const color = initializeColor(vertices);\n\n  for (let i = 0; i < vertices.length; i++) {\n    if (color[vertices[i]] === Colors.WHITE) {\n      depthFirstSearchVisit(vertices[i], color, adjList, callback);\n    }\n  }\n};\n\nconst DFSVisit = (u, color, d, f, p, time, adjList) => {\n  // console.log('discovered ' + u);\n  color[u] = Colors.GREY;\n  d[u] = ++time.count;\n  const neighbors = adjList.get(u);\n  for (let i = 0; i < neighbors.length; i++) {\n    const w = neighbors[i];\n    if (color[w] === Colors.WHITE) {\n      p[w] = u;\n      DFSVisit(w, color, d, f, p, time, adjList);\n    }\n  }\n  color[u] = Colors.BLACK;\n  f[u] = ++time.count;\n  // console.log('explored ' + u);\n};\n\nexport const DFS = graph => {\n  const vertices = graph.getVertices();\n  const adjList = graph.getAdjList();\n  const color = initializeColor(vertices);\n  const d = {};\n  const f = {};\n  const p = {};\n  const time = { count: 0 };\n  for (let i = 0; i < vertices.length; i++) {\n    f[vertices[i]] = 0;\n    d[vertices[i]] = 0;\n    p[vertices[i]] = null;\n  }\n  for (let i = 0; i < vertices.length; i++) {\n    if (color[vertices[i]] === Colors.WHITE) {\n      DFSVisit(vertices[i], color, d, f, p, time, adjList);\n    }\n  }\n  return {\n    discovery: d,\n    finished: f,\n    predecessors: p\n  };\n};\n","import Queue from '../../data-structures/queue';\n\nconst Colors = {\n  WHITE: 0,\n  GREY: 1,\n  BLACK: 2\n};\n\nconst initializeColor = vertices => {\n  const color = {};\n  for (let i = 0; i < vertices.length; i++) {\n    color[vertices[i]] = Colors.WHITE;\n  }\n  return color;\n};\n\nexport const breadthFirstSearch = (graph, startVertex, callback) => {\n  const vertices = graph.getVertices();\n  const adjList = graph.getAdjList();\n  const color = initializeColor(vertices);\n  const queue = new Queue();\n\n  queue.enqueue(startVertex);\n\n  while (!queue.isEmpty()) {\n    const u = queue.dequeue();\n    const neighbors = adjList.get(u);\n    color[u] = Colors.GREY;\n    for (let i = 0; i < neighbors.length; i++) {\n      const w = neighbors[i];\n      if (color[w] === Colors.WHITE) {\n        color[w] = Colors.GREY;\n        queue.enqueue(w);\n      }\n    }\n    color[u] = Colors.BLACK;\n    if (callback) {\n      callback(u);\n    }\n  }\n};\n\nexport const BFS = (graph, startVertex) => {\n  const vertices = graph.getVertices();\n  const adjList = graph.getAdjList();\n  const color = initializeColor(vertices);\n  const queue = new Queue();\n  const distances = {};\n  const predecessors = {};\n  queue.enqueue(startVertex);\n  for (let i = 0; i < vertices.length; i++) {\n    distances[vertices[i]] = 0;\n    predecessors[vertices[i]] = null;\n  }\n  while (!queue.isEmpty()) {\n    const u = queue.dequeue();\n    const neighbors = adjList.get(u);\n    color[u] = Colors.GREY;\n    for (let i = 0; i < neighbors.length; i++) {\n      const w = neighbors[i];\n      if (color[w] === Colors.WHITE) {\n        color[w] = Colors.GREY;\n        distances[w] = distances[u] + 1;\n        predecessors[w] = u;\n        queue.enqueue(w);\n      }\n    }\n    color[u] = Colors.BLACK;\n  }\n  return {\n    distances,\n    predecessors\n  };\n};\n","import Dictionary from './dictionary';\n\nexport default class Graph {\n  constructor(isDirected = false) {\n    this.isDirected = isDirected;\n    this.vertices = [];\n    this.adjList = new Dictionary();\n  }\n  addVertex(v) {\n    if (!this.vertices.includes(v)) {\n      this.vertices.push(v);\n      this.adjList.set(v, []); // initialize adjacency list with array as well;\n    }\n  }\n  addEdge(a, b) {\n    if (!this.adjList.get(a)) {\n      this.addVertex(a);\n    }\n    if (!this.adjList.get(b)) {\n      this.addVertex(b);\n    }\n    this.adjList.get(a).push(b);\n    if (this.isDirected !== true) {\n      this.adjList.get(b).push(a);\n    }\n  }\n  getVertices() {\n    return this.vertices;\n  }\n  getAdjList() {\n    return this.adjList;\n  }\n  toString() {\n    let s = '';\n    for (let i = 0; i < this.vertices.length; i++) {\n      s += `${this.vertices[i]} -> `;\n      const neighbors = this.adjList.get(this.vertices[i]);\n      for (let j = 0; j < neighbors.length; j++) {\n        s += `${neighbors[j]} `;\n      }\n      s += '\\n';\n    }\n    return s;\n  }\n}\n","import { defaultCompare, swap } from '../../util';\n\nfunction heapify(array, index, heapSize, compareFn) {\n  let largest = index;\n  const left = (2 * index) + 1;\n  const right = (2 * index) + 2;\n  if (left < heapSize && compareFn(array[left], array[index]) > 0) {\n    largest = left;\n  }\n  if (right < heapSize && compareFn(array[right], array[largest]) > 0) {\n    largest = right;\n  }\n  if (largest !== index) {\n    swap(array, index, largest);\n    heapify(array, largest, heapSize, compareFn);\n  }\n}\n\nfunction buildMaxHeap(array, compareFn) {\n  for (let i = Math.floor(array.length / 2); i >= 0; i -= 1) {\n    heapify(array, i, array.length, compareFn);\n  }\n  return array;\n}\n\nexport default function heapSort(array, compareFn = defaultCompare) {\n  let heapSize = array.length;\n  buildMaxHeap(array, compareFn);\n  while (heapSize > 1) {\n    swap(array, 0, --heapSize);\n    heapify(array, 0, heapSize, compareFn);\n  }\n  return array;\n}\n","import { Compare, defaultCompare, reverseCompare, swap } from '../util';\n\nexport class MinHeap {\n  constructor(compareFn = defaultCompare) {\n    this.compareFn = compareFn;\n    this.heap = [];\n  }\n  getLeftIndex(index) {\n    return (2 * index) + 1;\n  }\n  getRightIndex(index) {\n    return (2 * index) + 2;\n  }\n  getParentIndex(index) {\n    if (index === 0) {\n      return undefined;\n    }\n    return Math.floor((index - 1) / 2);\n  }\n  size() {\n    return this.heap.length;\n  }\n  isEmpty() {\n    return this.size() <= 0;\n  }\n  clear() {\n    this.heap = [];\n  }\n  findMinimum() {\n    return this.isEmpty() ? undefined : this.heap[0];\n  }\n  insert(value) {\n    if (value != null) {\n      const index = this.heap.length;\n      this.heap.push(value);\n      this.siftUp(index);\n      return true;\n    }\n    return false;\n  }\n  siftDown(index) {\n    let element = index;\n    const left = this.getLeftIndex(index);\n    const right = this.getRightIndex(index);\n    const size = this.size();\n    if (\n      left < size &&\n      this.compareFn(this.heap[element], this.heap[left]) === Compare.BIGGER_THAN\n    ) {\n      element = left;\n    }\n    if (\n      right < size &&\n      this.compareFn(this.heap[element], this.heap[right]) === Compare.BIGGER_THAN\n    ) {\n      element = right;\n    }\n    if (index !== element) {\n      swap(this.heap, index, element);\n      this.siftDown(element);\n    }\n  }\n  siftUp(index) {\n    let parent = this.getParentIndex(index);\n    while (\n      index > 0 &&\n      this.compareFn(this.heap[parent], this.heap[index]) === Compare.BIGGER_THAN\n    ) {\n      swap(this.heap, parent, index);\n      index = parent;\n      parent = this.getParentIndex(index);\n    }\n  }\n  extract() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    if (this.size() === 1) {\n      return this.heap.shift();\n    }\n    const removedValue = this.heap.shift();\n    this.siftDown(0);\n    return removedValue;\n  }\n  heapify(array) {\n    if (array) {\n      this.heap = array;\n    }\n    const maxIndex = Math.floor(this.size() / 2) - 1;\n    for (let i = 0; i <= maxIndex; i++) {\n      this.siftDown(i);\n    }\n    return this.heap;\n  }\n  getAsArray() {\n    return this.heap;\n  }\n}\nexport class MaxHeap extends MinHeap {\n  constructor(compareFn = defaultCompare) {\n    super(compareFn);\n    this.compareFn = compareFn;\n    this.compareFn = reverseCompare(compareFn);\n  }\n}\n","export function fibonacci(n) {\n  if (n < 1) {\n    return 0;\n  }\n  if (n <= 2) {\n    return 1;\n  }\n  return fibonacci(n - 1) + fibonacci(n - 2);\n}\n\nexport function fibonacciIterative(n) {\n  if (n < 1) { return 0; }\n  let fibNMinus2 = 0;\n  let fibNMinus1 = 1;\n  let fibN = n;\n  for (let i = 2; i <= n; i++) {\n    fibN = fibNMinus1 + fibNMinus2;\n    fibNMinus2 = fibNMinus1;\n    fibNMinus1 = fibN;\n  }\n  return fibN;\n}\n\nexport function fibonacciMemoization(n) {\n  if (n < 1) { return 0; }\n  const memo = [0, 1];\n  const fibonacciMem = num => {\n    if (memo[num] != null) { return memo[num]; }\n    memo[num] = fibonacciMem(num - 1) + fibonacciMem(num - 2);\n    return (memo[num] = fibonacciMem(num - 1) + fibonacciMem(num - 2));\n  };\n  return fibonacciMem(n);\n}\n","export function factorialIterative(number) {\n  if (number < 0) {\n    return undefined;\n  }\n  let total = 1;\n  for (let n = number; n > 1; n--) {\n    total *= n;\n  }\n  return total;\n}\n\nexport function factorial(n) {\n  if (n < 0) {\n    return undefined;\n  }\n  if (n === 1 || n === 0) {\n    return 1;\n  }\n  return n * factorial(n - 1);\n}\n","import { ValuePair } from './value-pair';\n\nexport class ValuePairLazy extends ValuePair {\n  constructor(key, value, isDeleted = false) {\n    super(key, value);\n    this.key = key;\n    this.value = value;\n    this.isDeleted = isDeleted;\n  }\n}\n","import { defaultToString } from '../util';\nimport { ValuePairLazy } from './models/value-pair-lazy';\n\nexport default class HashTableLinearProbingLazy {\n  constructor(toStrFn = defaultToString) {\n    this.toStrFn = toStrFn;\n    this.table = {};\n  }\n  loseloseHashCode(key) {\n    if (typeof key === 'number') {\n      return key;\n    }\n    const tableKey = this.toStrFn(key);\n    let hash = 0;\n    for (let i = 0; i < tableKey.length; i++) {\n      hash += tableKey.charCodeAt(i);\n    }\n    return hash % 37;\n  }\n  hashCode(key) {\n    return this.loseloseHashCode(key);\n  }\n  put(key, value) {\n    if (key != null && value != null) {\n      const position = this.hashCode(key);\n      if (\n        this.table[position] == null ||\n        (this.table[position] != null && this.table[position].isDeleted)\n      ) {\n        this.table[position] = new ValuePairLazy(key, value);\n      } else {\n        let index = position + 1;\n        while (this.table[index] != null && !this.table[position].isDeleted) {\n          index++;\n        }\n        this.table[index] = new ValuePairLazy(key, value);\n      }\n      return true;\n    }\n    return false;\n  }\n  get(key) {\n    const position = this.hashCode(key);\n    if (this.table[position] != null) {\n      if (this.table[position].key === key && !this.table[position].isDeleted) {\n        return this.table[position].value;\n      }\n      let index = position + 1;\n      while (\n        this.table[index] != null &&\n        (this.table[index].key !== key || this.table[index].isDeleted)\n      ) {\n        if (this.table[index].key === key && this.table[index].isDeleted) {\n          return undefined;\n        }\n        index++;\n      }\n      if (\n        this.table[index] != null &&\n        this.table[index].key === key &&\n        !this.table[index].isDeleted\n      ) {\n        return this.table[position].value;\n      }\n    }\n    return undefined;\n  }\n  remove(key) {\n    const position = this.hashCode(key);\n    if (this.table[position] != null) {\n      if (this.table[position].key === key && !this.table[position].isDeleted) {\n        this.table[position].isDeleted = true;\n        return true;\n      }\n      let index = position + 1;\n      while (\n        this.table[index] != null &&\n        (this.table[index].key !== key || this.table[index].isDeleted)\n      ) {\n        index++;\n      }\n      if (\n        this.table[index] != null &&\n        this.table[index].key === key &&\n        !this.table[index].isDeleted\n      ) {\n        this.table[index].isDeleted = true;\n        return true;\n      }\n    }\n    return false;\n  }\n  isEmpty() {\n    return this.size() === 0;\n  }\n  size() {\n    let count = 0;\n    Object.values(this.table).forEach(valuePair => {\n      count += valuePair.isDeleted === true ? 0 : 1;\n    });\n    return count;\n  }\n  clear() {\n    this.table = {};\n  }\n  getTable() {\n    return this.table;\n  }\n  toString() {\n    if (this.isEmpty()) {\n      return '';\n    }\n    const keys = Object.keys(this.table);\n    let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`;\n    for (let i = 1; i < keys.length; i++) {\n      objString = `${objString},{${keys[i]} => ${this.table[\n        keys[i]\n      ].toString()}}`;\n    }\n    return objString;\n  }\n}\n","import { defaultToString } from '../util';\nimport { ValuePair } from './models/value-pair';\n\nexport default class HashTableLinearProbing {\n  constructor(toStrFn = defaultToString) {\n    this.toStrFn = toStrFn;\n    this.table = {};\n  }\n  loseloseHashCode(key) {\n    if (typeof key === 'number') {\n      return key;\n    }\n    const tableKey = this.toStrFn(key);\n    let hash = 0;\n    for (let i = 0; i < tableKey.length; i++) {\n      hash += tableKey.charCodeAt(i);\n    }\n    return hash % 37;\n  }\n  hashCode(key) {\n    return this.loseloseHashCode(key);\n  }\n  put(key, value) {\n    if (key != null && value != null) {\n      const position = this.hashCode(key);\n      if (this.table[position] == null) {\n        this.table[position] = new ValuePair(key, value);\n      } else {\n        let index = position + 1;\n        while (this.table[index] != null) {\n          index++;\n        }\n        this.table[index] = new ValuePair(key, value);\n      }\n      return true;\n    }\n    return false;\n  }\n  get(key) {\n    const position = this.hashCode(key);\n    if (this.table[position] != null) {\n      if (this.table[position].key === key) {\n        return this.table[position].value;\n      }\n      let index = position + 1;\n      while (this.table[index] != null && this.table[index].key !== key) {\n        index++;\n      }\n      if (this.table[index] != null && this.table[index].key === key) {\n        return this.table[position].value;\n      }\n    }\n    return undefined;\n  }\n  remove(key) {\n    const position = this.hashCode(key);\n    if (this.table[position] != null) {\n      if (this.table[position].key === key) {\n        delete this.table[position];\n        this.verifyRemoveSideEffect(key, position);\n        return true;\n      }\n      let index = position + 1;\n      while (this.table[index] != null && this.table[index].key !== key) {\n        index++;\n      }\n      if (this.table[index] != null && this.table[index].key === key) {\n        delete this.table[index];\n        this.verifyRemoveSideEffect(key, index);\n        return true;\n      }\n    }\n    return false;\n  }\n  verifyRemoveSideEffect(key, removedPosition) {\n    const hash = this.hashCode(key);\n    let index = removedPosition + 1;\n    while (this.table[index] != null) {\n      const posHash = this.hashCode(this.table[index].key);\n      if (posHash <= hash || posHash <= removedPosition) {\n        this.table[removedPosition] = this.table[index];\n        delete this.table[index];\n        removedPosition = index;\n      }\n      index++;\n    }\n  }\n  isEmpty() {\n    return this.size() === 0;\n  }\n  size() {\n    return Object.keys(this.table).length;\n  }\n  clear() {\n    this.table = {};\n  }\n  getTable() {\n    return this.table;\n  }\n  toString() {\n    if (this.isEmpty()) {\n      return '';\n    }\n    const keys = Object.keys(this.table);\n    let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`;\n    for (let i = 1; i < keys.length; i++) {\n      objString = `${objString},{${keys[i]} => ${this.table[\n        keys[i]\n      ].toString()}}`;\n    }\n    return objString;\n  }\n}\n","import { defaultToString } from '../util';\nimport LinkedList from './linked-list';\nimport { ValuePair } from './models/value-pair';\n\nexport default class HashTableSeparateChaining {\n  constructor(toStrFn = defaultToString) {\n    this.toStrFn = toStrFn;\n    this.table = {};\n  }\n  loseloseHashCode(key) {\n    if (typeof key === 'number') {\n      return key;\n    }\n    const tableKey = this.toStrFn(key);\n    let hash = 0;\n    for (let i = 0; i < tableKey.length; i++) {\n      hash += tableKey.charCodeAt(i);\n    }\n    return hash % 37;\n  }\n  hashCode(key) {\n    return this.loseloseHashCode(key);\n  }\n  put(key, value) {\n    if (key != null && value != null) {\n      const position = this.hashCode(key);\n      if (this.table[position] == null) {\n        this.table[position] = new LinkedList();\n      }\n      this.table[position].push(new ValuePair(key, value));\n      return true;\n    }\n    return false;\n  }\n  get(key) {\n    const position = this.hashCode(key);\n    const linkedList = this.table[position];\n    if (linkedList != null && !linkedList.isEmpty()) {\n      let current = linkedList.getHead();\n      while (current != null) {\n        if (current.element.key === key) {\n          return current.element.value;\n        }\n        current = current.next;\n      }\n    }\n    return undefined;\n  }\n  remove(key) {\n    const position = this.hashCode(key);\n    const linkedList = this.table[position];\n    if (linkedList != null && !linkedList.isEmpty()) {\n      let current = linkedList.getHead();\n      while (current != null) {\n        if (current.element.key === key) {\n          linkedList.remove(current.element);\n          if (linkedList.isEmpty()) {\n            delete this.table[position];\n          }\n          return true;\n        }\n        current = current.next;\n      }\n    }\n    return false;\n  }\n  isEmpty() {\n    return this.size() === 0;\n  }\n  size() {\n    let count = 0;\n    Object.values(this.table).forEach(linkedList => {\n      count += linkedList.size();\n    });\n    return count;\n  }\n  clear() {\n    this.table = {};\n  }\n  getTable() {\n    return this.table;\n  }\n  toString() {\n    if (this.isEmpty()) {\n      return '';\n    }\n    const keys = Object.keys(this.table);\n    let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`;\n    for (let i = 1; i < keys.length; i++) {\n      objString = `${objString},{${keys[i]} => ${this.table[\n        keys[i]\n      ].toString()}}`;\n    }\n    return objString;\n  }\n}\n","import { defaultToString } from '../util';\nimport { ValuePair } from './models/value-pair';\n\nexport default class HashTable {\n  constructor(toStrFn = defaultToString) {\n    this.toStrFn = toStrFn;\n    this.table = {};\n  }\n  loseloseHashCode(key) {\n    if (typeof key === 'number') {\n      return key;\n    }\n    const tableKey = this.toStrFn(key);\n    let hash = 0;\n    for (let i = 0; i < tableKey.length; i++) {\n      hash += tableKey.charCodeAt(i);\n    }\n    return hash % 37;\n  }\n  /* djb2HashCode(key) {\n    const tableKey = this.toStrFn(key);\n    let hash = 5381;\n    for (let i = 0; i < tableKey.length; i++) {\n      hash = (hash * 33) + tableKey.charCodeAt(i);\n    }\n    return hash % 1013;\n  } */\n  hashCode(key) {\n    return this.loseloseHashCode(key);\n  }\n  put(key, value) {\n    if (key != null && value != null) {\n      const position = this.hashCode(key);\n      this.table[position] = new ValuePair(key, value);\n      return true;\n    }\n    return false;\n  }\n  get(key) {\n    const valuePair = this.table[this.hashCode(key)];\n    return valuePair == null ? undefined : valuePair.value;\n  }\n  remove(key) {\n    const hash = this.hashCode(key);\n    const valuePair = this.table[hash];\n    if (valuePair != null) {\n      delete this.table[hash];\n      return true;\n    }\n    return false;\n  }\n  getTable() {\n    return this.table;\n  }\n  isEmpty() {\n    return this.size() === 0;\n  }\n  size() {\n    return Object.keys(this.table).length;\n  }\n  clear() {\n    this.table = {};\n  }\n  toString() {\n    if (this.isEmpty()) {\n      return '';\n    }\n    const keys = Object.keys(this.table);\n    let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`;\n    for (let i = 1; i < keys.length; i++) {\n      objString = `${objString},{${keys[i]} => ${this.table[keys[i]].toString()}}`;\n    }\n    return objString;\n  }\n}\n","export default class Set {\n  constructor() {\n    this.items = {};\n  }\n  add(element) {\n    if (!this.has(element)) {\n      this.items[element] = element;\n      return true;\n    }\n    return false;\n  }\n  delete(element) {\n    if (this.has(element)) {\n      delete this.items[element];\n      return true;\n    }\n    return false;\n  }\n  has(element) {\n    return Object.prototype.hasOwnProperty.call(this.items, element);\n  }\n  values() {\n    return Object.values(this.items);\n  }\n  union(otherSet) {\n    const unionSet = new Set();\n    this.values().forEach(value => unionSet.add(value));\n    otherSet.values().forEach(value => unionSet.add(value));\n    return unionSet;\n  }\n  intersection(otherSet) {\n    const intersectionSet = new Set();\n    const values = this.values();\n    const otherValues = otherSet.values();\n    let biggerSet = values;\n    let smallerSet = otherValues;\n    if (otherValues.length - values.length > 0) {\n      biggerSet = otherValues;\n      smallerSet = values;\n    }\n    smallerSet.forEach(value => {\n      if (biggerSet.includes(value)) {\n        intersectionSet.add(value);\n      }\n    });\n    return intersectionSet;\n  }\n  difference(otherSet) {\n    const differenceSet = new Set();\n    this.values().forEach(value => {\n      if (!otherSet.has(value)) {\n        differenceSet.add(value);\n      }\n    });\n    return differenceSet;\n  }\n  isSubsetOf(otherSet) {\n    if (this.size() > otherSet.size()) {\n      return false;\n    }\n    let isSubset = true;\n    this.values().every(value => {\n      if (!otherSet.has(value)) {\n        isSubset = false;\n        return false;\n      }\n      return true;\n    });\n    return isSubset;\n  }\n  isEmpty() {\n    return this.size() === 0;\n  }\n  size() {\n    return Object.keys(this.items).length;\n  }\n  clear() {\n    this.items = {};\n  }\n  toString() {\n    if (this.isEmpty()) {\n      return '';\n    }\n    const values = this.values();\n    let objString = `${values[0]}`;\n    for (let i = 1; i < values.length; i++) {\n      objString = `${objString},${values[i].toString()}`;\n    }\n    return objString;\n  }\n}\n","import DoublyLinkedList from './doubly-linked-list';\n\nexport default class StackLinkedList {\n  constructor() {\n    this.items = new DoublyLinkedList();\n  }\n  push(element) {\n    this.items.push(element);\n  }\n  pop() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    const result = this.items.removeAt(this.size() - 1);\n    return result;\n  }\n  peek() {\n    if (this.isEmpty()) {\n      return undefined;\n    }\n    return this.items.getElementAt(this.size() - 1).element;\n  }\n  isEmpty() {\n    return this.items.isEmpty();\n  }\n  size() {\n    return this.items.size();\n  }\n  clear() {\n    this.items.clear();\n  }\n  toString() {\n    return this.items.toString();\n  }\n}\n","import { Compare, defaultCompare, defaultEquals } from '../util';\nimport LinkedList from './linked-list';\n\nexport default class SortedLinkedList extends LinkedList {\n  constructor(equalsFn = defaultEquals, compareFn = defaultCompare) {\n    super(equalsFn);\n    this.equalsFn = equalsFn;\n    this.compareFn = compareFn;\n  }\n  push(element) {\n    if (this.isEmpty()) {\n      super.push(element);\n    } else {\n      const index = this.getIndexNextSortedElement(element);\n      super.insert(element, index);\n    }\n  }\n  insert(element, index = 0) {\n    if (this.isEmpty()) {\n      return super.insert(element, index === 0 ? index : 0);\n    }\n    const pos = this.getIndexNextSortedElement(element);\n    return super.insert(element, pos);\n  }\n  getIndexNextSortedElement(element) {\n    let current = this.head;\n    let i = 0;\n    for (; i < this.size() && current; i++) {\n      const comp = this.compareFn(element, current.element);\n      if (comp === Compare.LESS_THAN) {\n        return i;\n      }\n      current = current.next;\n    }\n    return i;\n  }\n}\n","import { defaultEquals } from '../util';\nimport LinkedList from './linked-list';\nimport { Node } from './models/linked-list-models';\n\nexport default class CircularLinkedList extends LinkedList {\n  constructor(equalsFn = defaultEquals) {\n    super(equalsFn);\n  }\n  push(element) {\n    const node = new Node(element);\n    let current;\n    if (this.head == null) {\n      this.head = node;\n    } else {\n      current = this.getElementAt(this.size() - 1);\n      current.next = node;\n    }\n    // set node.next to head - to have circular list\n    node.next = this.head;\n    this.count++;\n  }\n  insert(element, index) {\n    if (index >= 0 && index <= this.count) {\n      const node = new Node(element);\n      let current = this.head;\n      if (index === 0) {\n        if (this.head == null) {\n          // if no node  in list\n          this.head = node;\n          node.next = this.head;\n        } else {\n          node.next = current;\n          current = this.getElementAt(this.size());\n          // update last element\n          this.head = node;\n          current.next = this.head;\n        }\n      } else {\n        const previous = this.getElementAt(index - 1);\n        node.next = previous.next;\n        previous.next = node;\n      }\n      this.count++;\n      return true;\n    }\n    return false;\n  }\n  removeAt(index) {\n    if (index >= 0 && index < this.count) {\n      let current = this.head;\n      if (index === 0) {\n        if (this.size() === 1) {\n          this.head = undefined;\n        } else {\n          const removed = this.head;\n          current = this.getElementAt(this.size() - 1);\n          this.head = this.head.next;\n          current.next = this.head;\n          current = removed;\n        }\n      } else {\n        // no need to update last element for circular list\n        const previous = this.getElementAt(index - 1);\n        current = previous.next;\n        previous.next = current.next;\n      }\n      this.count--;\n      return current.element;\n    }\n    return undefined;\n  }\n}\n","import Deque from '../data-structures/deque';\n\nexport function palindromeChecker(aString) {\n  if (\n    aString === undefined ||\n    aString === null ||\n    (aString !== null && aString.length === 0)\n  ) {\n    return false;\n  }\n  const deque = new Deque();\n  const lowerString = aString.toLocaleLowerCase().split(' ').join('');\n  let isEqual = true;\n  let firstChar;\n  let lastChar;\n\n  for (let i = 0; i < lowerString.length; i++) {\n    deque.addBack(lowerString.charAt(i));\n  }\n\n  while (deque.size() > 1 && isEqual) {\n    firstChar = deque.removeFront();\n    lastChar = deque.removeBack();\n    if (firstChar !== lastChar) {\n      isEqual = false;\n    }\n  }\n\n  return isEqual;\n}\n","import Queue from '../data-structures/queue';\n\nexport function hotPotato(elementsList, num) {\n  const queue = new Queue();\n  const elimitatedList = [];\n\n  for (let i = 0; i < elementsList.length; i++) {\n    queue.enqueue(elementsList[i]);\n  }\n\n  while (queue.size() > 1) {\n    for (let i = 0; i < num; i++) {\n      queue.enqueue(queue.dequeue());\n    }\n    elimitatedList.push(queue.dequeue());\n  }\n\n  return {\n    eliminated: elimitatedList,\n    winner: queue.dequeue()\n  };\n}\n","// @ts-check\nimport Stack from '../data-structures/stack';\n\nexport function parenthesesChecker(symbols) {\n  const stack = new Stack();\n  const opens = '([{';\n  const closers = ')]}';\n  let balanced = true;\n  let index = 0;\n  let symbol;\n  let top;\n\n  while (index < symbols.length && balanced) {\n    symbol = symbols.charAt(index);\n    if (opens.indexOf(symbol) >= 0) {\n      stack.push(symbol);\n    } else if (stack.isEmpty()) {\n      balanced = false;\n    } else {\n      top = stack.pop();\n      if (!(opens.indexOf(top) === closers.indexOf(symbol))) {\n        balanced = false;\n      }\n    }\n    index++;\n  }\n  if (balanced && stack.isEmpty()) {\n    return true;\n  }\n  return false;\n}\n","// @ts-check\nimport Stack from '../data-structures/stack';\n\nexport function decimalToBinary(decNumber) {\n  const remStack = new Stack();\n  let number = decNumber;\n  let rem;\n  let binaryString = '';\n\n  while (number > 0) {\n    rem = Math.floor(number % 2);\n    remStack.push(rem);\n    number = Math.floor(number / 2);\n  }\n\n  while (!remStack.isEmpty()) {\n    binaryString += remStack.pop().toString();\n  }\n\n  return binaryString;\n}\n\nexport function baseConverter(decNumber, base) {\n  const remStack = new Stack();\n  const digits = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';\n  let number = decNumber;\n  let rem;\n  let baseString = '';\n\n  if (!(base >= 2 && base <= 36)) {\n    return '';\n  }\n\n  while (number > 0) {\n    rem = Math.floor(number % base);\n    remStack.push(rem);\n    number = Math.floor(number / base);\n  }\n\n  while (!remStack.isEmpty()) {\n    baseString += digits[remStack.pop()];\n  }\n\n  return baseString;\n}\n","// @ts-check\nimport Stack from '../data-structures/stack';\n\nfunction towerOfHanoi(plates, source, helper, dest, sourceName, helperName, destName, moves = []) {\n  if (plates <= 0) {\n    return moves;\n  }\n  if (plates === 1) {\n    dest.push(source.pop());\n    const move = {};\n    move[sourceName] = source.toString();\n    move[helperName] = helper.toString();\n    move[destName] = dest.toString();\n    moves.push(move);\n  } else {\n    towerOfHanoi(plates - 1, source, dest, helper, sourceName, destName, helperName, moves);\n    dest.push(source.pop());\n    const move = {};\n    move[sourceName] = source.toString();\n    move[helperName] = helper.toString();\n    move[destName] = dest.toString();\n    moves.push(move);\n    towerOfHanoi(plates - 1, helper, source, dest, helperName, sourceName, destName, moves);\n  }\n  return moves;\n}\n\nexport function hanoiStack(plates) {\n  const source = new Stack();\n  const dest = new Stack();\n  const helper = new Stack();\n\n  for (let i = plates; i > 0; i--) {\n    source.push(i);\n  }\n\n  return towerOfHanoi(plates, source, helper, dest, 'source', 'helper', 'dest');\n}\n\nexport function hanoi(plates, source, helper, dest, moves = []) {\n  if (plates <= 0) {\n    return moves;\n  }\n  if (plates === 1) {\n    moves.push([source, dest]);\n  } else {\n    hanoi(plates - 1, source, dest, helper, moves);\n    moves.push([source, dest]);\n    hanoi(plates - 1, helper, source, dest, moves);\n  }\n  return moves;\n}\n","// @ts-check\n\nexport default class StackArray {\n  constructor() {\n    this.items = [];\n  }\n  push(element) {\n    this.items.push(element);\n  }\n\n  pop() {\n    return this.items.pop();\n  }\n\n  peek() {\n    return this.items[this.items.length - 1];\n  }\n\n  isEmpty() {\n    return this.items.length === 0;\n  }\n\n  size() {\n    return this.items.length;\n  }\n\n  clear() {\n    this.items = [];\n  }\n\n  toArray() {\n    return this.items;\n  }\n\n  toString() {\n    return this.items.toString();\n  }\n}\n","import * as _util from './util';\n\n// chapters 05 and 07\nexport const util = _util;\n\n// chapter 03\nexport { default as StackArray } from './data-structures/stack-array';\nexport { default as Stack } from './data-structures/stack';\nexport { default as hanoi } from './others/hanoi';\nexport { default as hanoiStack } from './others/hanoi';\nexport { default as baseConverter } from './others/base-converter';\nexport { default as decimalToBinary } from './others/base-converter';\nexport { default as parenthesesChecker } from './others/balanced-symbols';\n\n// chapter 04\nexport { default as Queue } from './data-structures/queue';\nexport { default as Deque } from './data-structures/deque';\nexport { default as hotPotato } from './others/hot-potato';\nexport { default as palindromeChecker } from './others/palindrome-checker';\n\n// chapter 05\nexport { default as LinkedList } from './data-structures/linked-list';\nexport { default as DoublyLinkedList } from './data-structures/doubly-linked-list';\nexport { default as CircularLinkedList } from './data-structures/circular-linked-list';\nexport { default as SortedLinkedList } from './data-structures/sorted-linked-list';\nexport { default as StackLinkedList } from './data-structures/stack-linked-list';\n\n// chapter 06\nexport { default as Set } from './data-structures/set';\n\n// chapter 07\nexport { default as Dictionary } from './data-structures/dictionary';\nexport { default as HashTable } from './data-structures/hash-table';\nexport { default as HashTableSeparateChaining } from './data-structures/hash-table-separate-chaining';\nexport { default as HashTableLinearProbing } from './data-structures/hash-table-linear-probing';\nexport { default as HashTableLinearProbingLazy } from './data-structures/hash-table-linear-probing-lazy';\n\n// chapter 08\nexport { default as factorialIterative } from './others/factorial';\nexport { default as factorial } from './others/factorial';\nexport { default as fibonacci } from './others/fibonacci';\nexport { default as fibonacciIterative } from './others/fibonacci';\nexport { default as fibonacciMemoization } from './others/fibonacci';\n\n// chapter 09\nexport { default as BinarySearchTree } from './data-structures/binary-search-tree';\nexport { default as AVLTree } from './data-structures/avl-tree';\n\n// chapter 10\nexport { MinHeap } from './data-structures/heap';\nexport { MaxHeap } from './data-structures/heap';\nexport { default as heapSort } from './algorithms/sorting/heap-sort';\n\n// chapter 11\nexport { default as Graph } from './data-structures/graph';\nexport { breadthFirstSearch } from './algorithms/graph/breadth-first-search';\nexport { BFS } from './algorithms/graph/breadth-first-search';\nexport { depthFirstSearch } from './algorithms/graph/depth-first-search';\nexport { DFS } from './algorithms/graph/depth-first-search';\nexport { dijkstra } from './algorithms/graph/dijkstra';\nexport { floydWarshall } from './algorithms/graph/floyd-warshall';\nexport { prim } from './algorithms/graph/prim';\nexport { kruskal } from './algorithms/graph/kruskal';\n\n// chapter 12\nexport { shuffle } from './algorithms/shuffle/fisher–yates';\n\nexport { bubbleSort } from './algorithms/sorting/bubble-sort';\nexport { modifiedBubbleSort } from './algorithms/sorting/bubble-sort-improved';\nexport { bucketSort } from './algorithms/sorting/bucket-sort';\nexport { countingSort } from './algorithms/sorting/counting-sort';\nexport { insertionSort } from './algorithms/sorting/insertion-sort';\nexport { mergeSort } from './algorithms/sorting/merge-sort';\nexport { quickSort } from './algorithms/sorting/quicksort';\nexport { radixSort } from './algorithms/sorting/radix-sort';\nexport { selectionSort } from './algorithms/sorting/selection-sort';\nexport { shellSort } from './algorithms/sorting/shell-sort';\n\nexport { binarySearch } from './algorithms/search/binary-search';\nexport { interpolationSearch } from './algorithms/search/interpolation-search';\nexport { sequentialSearch } from './algorithms/search/sequential-search';\nexport { findMaxValue } from './algorithms/search/min-max-search';\nexport { findMinValue } from './algorithms/search/min-max-search';\n"],"sourceRoot":""}
\ No newline at end of file
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..71f12f77
--- /dev/null
+++ b/examples/chapter10/01-UsingMinHeap.js
@@ -0,0 +1,25 @@
+const { MinHeap } = PacktDataStructuresAlgorithms;
+
+const heap = new MinHeap();
+
+heap.insert(2);
+heap.insert(3);
+heap.insert(4);
+heap.insert(5);
+
+heap.insert(1);
+
+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.insert(6);
+heap.insert(7);
+
+console.log(heap.getAsArray());
+
+console.log('Extract minimum: ', heap.extract());
+console.log(heap.getAsArray());
+
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/chapter11/03-DFS.js b/examples/chapter11/03-DFS.js
index c29686eb..5c440a74 100644
--- a/examples/chapter11/03-DFS.js
+++ b/examples/chapter11/03-DFS.js
@@ -46,9 +46,9 @@ graph.addEdge('C', 'F');
 graph.addEdge('F', 'E');
 
 const result = DFS(graph);
-console.log(result.discovery);
-console.log(result.finished);
-console.log(result.predecessors);
+console.log('discovery', result.discovery);
+console.log('finished', result.finished);
+console.log('predecessors', result.predecessors);
 
 const fTimes = result.finished;
 s = '';
diff --git a/examples/index.html b/examples/index.html
index 5a9bb80c..4e1f4cb3 100644
--- a/examples/index.html
+++ b/examples/index.html
@@ -190,6 +190,19 @@
           </div>
         </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">
+                <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>
+        </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.json b/package.json
index 88846051..1f3edd60 100644
--- a/package.json
+++ b/package.json
@@ -75,6 +75,7 @@
     "tslint": "^5.9.1",
     "typescript": "^2.7.2",
     "webpack": "^4.1.1",
+    "webpack-cli": "^2.0.12",
     "yargs": "^11.0.0"
   }
 }
diff --git a/src/js/algorithms/graph/depth-first-search.js b/src/js/algorithms/graph/depth-first-search.js
index 208925ce..8427659f 100644
--- a/src/js/algorithms/graph/depth-first-search.js
+++ b/src/js/algorithms/graph/depth-first-search.js
@@ -46,7 +46,7 @@ export const depthFirstSearch = (graph, callback) => {
 const DFSVisit = (u, color, d, f, p, time, adjList) => {
   // console.log('discovered ' + u);
   color[u] = Colors.GREY;
-  d[u] = ++time;
+  d[u] = ++time.count;
   const neighbors = adjList.get(u);
   for (let i = 0; i < neighbors.length; i++) {
     const w = neighbors[i];
@@ -56,7 +56,7 @@ const DFSVisit = (u, color, d, f, p, time, adjList) => {
     }
   }
   color[u] = Colors.BLACK;
-  f[u] = ++time;
+  f[u] = ++time.count;
   // console.log('explored ' + u);
 };
 
@@ -67,7 +67,7 @@ export const DFS = graph => {
   const d = {};
   const f = {};
   const p = {};
-  const time = 0;
+  const time = { count: 0 };
   for (let i = 0; i < vertices.length; i++) {
     f[vertices[i]] = 0;
     d[vertices[i]] = 0;
diff --git a/src/js/data-structures/graph.js b/src/js/data-structures/graph.js
index d838c4f6..d8c92044 100644
--- a/src/js/data-structures/graph.js
+++ b/src/js/data-structures/graph.js
@@ -20,7 +20,7 @@ export default class Graph {
       this.addVertex(b);
     }
     this.adjList.get(a).push(b);
-    if (!this.isDirected) {
+    if (this.isDirected !== true) {
       this.adjList.get(b).push(a);
     }
   }
diff --git a/src/js/data-structures/heap.js b/src/js/data-structures/heap.js
index edce1608..136d50df 100644
--- a/src/js/data-structures/heap.js
+++ b/src/js/data-structures/heap.js
@@ -26,7 +26,7 @@ export class MinHeap {
   clear() {
     this.heap = [];
   }
-  find() {
+  findMinimum() {
     return this.isEmpty() ? undefined : this.heap[0];
   }
   insert(value) {
@@ -43,12 +43,15 @@ export class MinHeap {
     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) {
+    if (
+      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
+      this.compareFn(this.heap[element], this.heap[right]) === Compare.BIGGER_THAN
     ) {
       element = right;
     }
@@ -59,7 +62,10 @@ export class MinHeap {
   }
   siftUp(index) {
     let parent = this.getParentIndex(index);
-    while (index > 0 && this.compareFn(this.heap[parent], this.heap[index]) > Compare.BIGGER_THAN) {
+    while (
+      index > 0 &&
+      this.compareFn(this.heap[parent], this.heap[index]) === Compare.BIGGER_THAN
+    ) {
       swap(this.heap, parent, index);
       index = parent;
       parent = this.getParentIndex(index);
@@ -79,11 +85,15 @@ export class MinHeap {
   heapify(array) {
     if (array) {
       this.heap = array;
-      this.heap.unshift(null); // remove all null elements
     }
-    for (let i = this.size() - 1; i > 0; i--) {
+    const maxIndex = Math.floor(this.size() / 2) - 1;
+    for (let i = 0; i <= maxIndex; i++) {
       this.siftDown(i);
     }
+    return this.heap;
+  }
+  getAsArray() {
+    return this.heap;
   }
 }
 export class MaxHeap extends MinHeap {
diff --git a/src/ts/data-structures/heap.ts b/src/ts/data-structures/heap.ts
index 6dc06585..f2b269b3 100644
--- a/src/ts/data-structures/heap.ts
+++ b/src/ts/data-structures/heap.ts
@@ -103,6 +103,10 @@ export class MinHeap<T> {
 
     return this.heap;
   }
+
+  getAsArray() {
+    return this.heap;
+  }
 }
 
 export class MaxHeap<T> extends MinHeap<T> {
diff --git a/test/ts/data-structures/heap.spec.ts b/test/ts/data-structures/heap.spec.ts
index 7296bf63..abfdedc9 100644
--- a/test/ts/data-structures/heap.spec.ts
+++ b/test/ts/data-structures/heap.spec.ts
@@ -1,5 +1,5 @@
 import 'mocha';
-// import { expect } from 'chai';
+import { expect } from 'chai';
 import { MinHeap } from '../../../src/ts/index';
 import { MaxHeap } from '../../../src/ts/data-structures/heap';
 import heapSort from '../../../src/ts/algorithms/sorting/heap-sort';
@@ -15,12 +15,27 @@ describe('Heap', () => {
 
   });
 
-  it('inserts elements in the AVLTree', () => {
+  it('inserts elements in the Heap', () => {
+
+    let min = 2;
 
-    heap.insert(3);
     heap.insert(2);
-    heap.insert(1);
+    expect(heap.findMinimum()).to.equal(min);
+    heap.insert(3);
+    expect(heap.findMinimum()).to.equal(min);
     heap.insert(4);
+    expect(heap.findMinimum()).to.equal(min);
+    heap.insert(5);
+    expect(heap.findMinimum()).to.equal(min);
+
+    heap.insert(1);
+    min = 1;
+    expect(heap.findMinimum()).to.equal(min);
+
+    heap.insert(6);
+    heap.insert(9);
+    heap.insert(10);
+    heap.insert(14);
 
     heap.extract();
     heap.extract();
diff --git a/webpack.config.js b/webpack.config.js
index f7cdebe0..6d033ef4 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,7 +1,7 @@
 // @ts-check
 /* eslint-disable */
 const webpack = require('webpack');
-const UglifyJsPlugin = webpack.optimize.UglifyJsPlugin;
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin');;
 const path = require('path');
 const env = require('yargs').argv.env;
 
@@ -11,7 +11,7 @@ let plugins = [],
   outputFile;
 
 if (env === 'build') {
-  plugins.push(new UglifyJsPlugin({ minimize: true }));
+  // plugins.push(new UglifyJsPlugin({ minimize: true }));
   outputFile = libraryName + '.min.js';
 } else {
   outputFile = libraryName + '.js';
@@ -40,7 +40,17 @@ const config = {
     modules: [path.resolve('./node_modules'), path.resolve('./src/js')],
     extensions: ['.json', '.js']
   },
-  plugins: plugins
+  optimization: {
+    minimizer: [
+      // we specify a custom UglifyJsPlugin here to get source maps in production
+      new UglifyJsPlugin({
+        cache: true,
+        parallel: true,
+        sourceMap: true
+      })
+    ]
+  }
+ // plugins: plugins
 };
 
 module.exports = config;