Begin moving to ES6 syntax via linting changes.

.eslintrc.json

@@ -50,6 +50,7 @@
  "no-empty": 2,
  "no-plusplus": 2,
  "no-undef": 2,
+ "no-var": 2,
  "linebreak-style": 0,
  "max-depth": [
  2,

package.json

@@ -17,6 +17,7 @@
  },
  "scripts": {
  "build": "gulp build",
+ "lint": "gulp lint",
  "test": "gulp test",
  "deploy": "npm run doc:build && gh-pages -d dist -b gh-pages",
  "doc": "npm run doc:build && npm run doc:view",

src/combinatorics/cartesianproduct.js

@@ -1,14 +1,14 @@
 (function (exports) {
  'use strict';
 
- var cartesianProduct = (function () {
- var result;
+ let cartesianProduct = (function () {
+ let result;
 
  function cartesianProduct(sets, index, current) {
  if (index === sets.length) {
  return result.push(current.slice());
  }
- for (var i = 0; i < sets[index].length; i += 1) {
+ for (let i = 0; i < sets[index].length; i += 1) {
  current[index] = sets[index][i];
  cartesianProduct(sets, index + 1, current);
  }

src/combinatorics/combinations.js

@@ -1,15 +1,15 @@
 (function (exports) {
  'use strict';
 
- var combinations = (function () {
- var res = [];
+ let combinations = (function () {
+ let res = [];
 
  function combinations(arr, k, start, idx, current) {
  if (idx === k) {
  res.push(current.slice());
  return;
  }
- for (var i = start; i < arr.length; i += 1) {
+ for (let i = start; i < arr.length; i += 1) {
  current[idx] = arr[i];
  combinations(arr, k, i + 1, idx + 1, current);
  }
@@ -42,7 +42,7 @@
  return function (arr, k) {
  res = [];
  combinations(arr, k, 0, 0, []);
- var temp = res;
+ let temp = res;
  // Free the extra memory
  res = null;
  return temp;

src/combinatorics/permutations.js

@@ -1,11 +1,11 @@
 (function (exports) {
  'use strict';
- var permutations = (function () {
+ let permutations = (function () {
 
- var res;
+ let res;
 
  function swap(arr, i, j) {
- var temp = arr[i];
+ let temp = arr[i];
  arr[i] = arr[j];
  arr[j] = temp;
  }
@@ -14,7 +14,7 @@
  if (current >= arr.length) {
  return res.push(arr.slice());
  }
- for (var i = current; i < arr.length; i += 1) {
+ for (let i = current; i < arr.length; i += 1) {
  swap(arr, i, current);
  permutations(arr, current + 1);
  swap(arr, i, current);
@@ -51,7 +51,7 @@
  return function (arr) {
  res = [];
  permutations(arr, 0);
- var temp = res;
+ let temp = res;
  // Free the extra memory
  res = null;
  return temp;

src/combinatorics/variations-repetition.js

@@ -1,14 +1,14 @@
 (function (exports) {
  'use strict';
 
- var variationsWithRepetition = (function () {
- var res;
+ let variationsWithRepetition = (function () {
+ let res;
 
  function variations(arr, k, index, current) {
  if (k === index) {
  return res.push(current.slice());
  }
- for (var i = 0; i < arr.length; i += 1) {
+ for (let i = 0; i < arr.length; i += 1) {
  current[index] = arr[i];
  variations(arr, k, index + 1, current);
  }
@@ -44,7 +44,7 @@
  return function (arr, k) {
  res = [];
  variations(arr, k, 0, []);
- var temp = res;
+ let temp = res;
  res = undefined;
  return temp;
  };

src/compression/LZW/LZW.js

@@ -26,12 +26,12 @@
  };
 
  exports.LZW.compress = function (data) {
- var i;
- var dictionary = {};
- var character;
- var wc;
- var w = '';
- var result = [];
+ let i;
+ let dictionary = {};
+ let character;
+ let wc;
+ let w = '';
+ let result = [];
 
  for (i = 0; i < this.dictionarySize; i = i + 1) {
  dictionary[String.fromCharCode(i)] = i;
@@ -58,12 +58,12 @@
  };
 
  exports.LZW.decompress = function (compressedData) {
- var i;
- var dictionary = [];
- var w;
- var result;
- var key;
- var entry = '';
+ let i;
+ let dictionary = [];
+ let w;
+ let result;
+ let key;
+ let entry = '';
 
  for (i = 0; i < this.dictionarySize; i = i + 1) {
  dictionary[i] = String.fromCharCode(i);

src/compression/burrows-wheeler/burrows-wheeler.js

@@ -29,12 +29,12 @@
  */
  exports.burrowsWheeler.encode = function(str) {
  str = '$' + str;
- var combinations = [];
+ let combinations = [];
  for (let i = 0; i < str.length; i += 1) {
  combinations.push(str.substring(i) + str.substring(0, i));
  }
- var sorted = combinations.sort();
- var result = [];
+ let sorted = combinations.sort();
+ let result = [];
  for (let i = 0; i < sorted.length; i += 1) {
  result.push(combinations[i][str.length - 1]);
  }
@@ -45,19 +45,19 @@
  const sortedCharSequence = encodedStr.split('').sort().join('');
  const leftSide = {};
  const rightSide = {};
- var maxEachCharLeft = {};
- var maxEachCharRight = {};
+ let maxEachCharLeft = {};
+ let maxEachCharRight = {};
 
  for (let i = 0; i < encodedStr.length; i += 1) {
- var idLeft = sortedCharSequence[i];
+ let idLeft = sortedCharSequence[i];
  if (idLeft in maxEachCharLeft) {
  maxEachCharLeft[idLeft] = maxEachCharLeft[idLeft] + 1;
  } else {
  maxEachCharLeft[idLeft] = 1;
  }
  idLeft += String(maxEachCharLeft[idLeft]);
 
- var idRight = encodedStr[i];
+ let idRight = encodedStr[i];
  if (idRight in maxEachCharRight) {
  maxEachCharRight[idRight] = maxEachCharRight[idRight] + 1;
  } else {
@@ -68,10 +68,10 @@
  leftSide[idLeft] = {char: sortedCharSequence[i], right: idRight};
  rightSide[idRight] = {char: encodedStr[i], left: idRight};
  }
- var result = '';
- var firstChar = sortedCharSequence[0];
- var searchChar = firstChar + '1';
- var endChar = searchChar;
+ let result = '';
+ let firstChar = sortedCharSequence[0];
+ let searchChar = firstChar + '1';
+ let endChar = searchChar;
  while (rightSide[leftSide[searchChar].right].left !== endChar) {
  result += leftSide[searchChar].char;
  searchChar = rightSide[leftSide[searchChar].right].left;

src/compression/runlength/runlength.js

@@ -7,16 +7,16 @@
 (function (exports) {
  'use strict';
 
- var runLengthEncoding = (function () {
+ let runLengthEncoding = (function () {
 
  /**
  * Converts a given string to sequence of numbers
  * This takes O(n).
  */
  function convertToAscii(str) {
- var result = [];
- var currentChar = '';
- var i = 0;
+ let result = [];
+ let currentChar = '';
+ let i = 0;
  for (; i < str.length; i += 1) {
  currentChar = str[i].charCodeAt(0).toString(2);
  currentChar = new Array(9 - currentChar.length).join('0') + currentChar;
@@ -30,10 +30,10 @@
  * Takes O(n^2).
  */
  function runLength(vector) {
- var result = [];
- var zeros = 0;
- var zerosTemp = '';
- var i = 0;
+ let result = [];
+ let zeros = 0;
+ let zerosTemp = '';
+ let i = 0;
  for (; i < vector.length; i += 1) {
  if (vector[i] === '0') {
  zeros += 1;
@@ -53,7 +53,7 @@
  * Takes O(n^2).
  */
  return function (str) {
- var asciiString = convertToAscii(str);
+ let asciiString = convertToAscii(str);
  return runLength(asciiString);
  };