Merge pull request trekhleb#3 from PeterShershov/master

small refactor in some sorting algorithms for better readability

Author: trekhleb

src/algorithms/sorting/bubble-sort/BubbleSort.js

@@ -5,7 +5,7 @@ export default class BubbleSort extends Sort {
  // Flag that holds info about whether the swap has occur or not.
  let swapped = false;
  // Clone original array to prevent its modification.
- const array = originalArray.slice(0);
+ const array = [...originalArray];
 
  for (let i = 0; i < array.length; i += 1) {
  swapped = false;

src/algorithms/sorting/insertion-sort/InsertionSort.js

@@ -2,7 +2,7 @@ import Sort from '../Sort';
 
 export default class InsertionSort extends Sort {
  sort(originalArray) {
- const array = originalArray.slice(0);
+ const array = [...originalArray];
 
  // Go through all array elements...
  for (let i = 0; i < array.length; i += 1) {

src/algorithms/sorting/quick-sort/QuickSort.js

@@ -3,7 +3,7 @@ import Sort from '../Sort';
 export default class QuickSort extends Sort {
  sort(originalArray) {
  // Clone original array to prevent it from modification.
- const array = originalArray.slice(0);
+ const array = [...originalArray];
 
  // If array has less then or equal to one elements then it is already sorted.
  if (array.length <= 1) {

src/algorithms/sorting/selection-sort/SelectionSort.js

@@ -3,7 +3,7 @@ import Sort from '../Sort';
 export default class SelectionSort extends Sort {
  sort(originalArray) {
  // Clone original array to prevent its modification.
- const array = originalArray.slice(0);
+ const array = [...originalArray];
 
  for (let i = 0; i < array.length - 1; i += 1) {
  let minIndex = i;

src/algorithms/sorting/shell-sort/ShellSort.js

@@ -3,7 +3,7 @@ import Sort from '../Sort';
 export default class ShellSort extends Sort {
  sort(originalArray) {
  // Prevent original array from mutations.
- const array = originalArray.slice(0);
+ const array = [...originalArray];
 
  // Define a gap distance.
  let gap = Math.floor(array.length / 2);