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This time I will bring you the use of JS to implement the sorting algorithm and the use of JS to implement the sorting algorithm. Notes What are the following? Let’s take a look at the actual cases.
Some common js sorting algorithm implementations, non-original, used for recording
Time complexity: O(n^2) ;
Fastest: when the data is in positive sequence
Slowest: when the data is in reverse sequence
function bubbleSort(arr) { var len = arr.length; for (var i = 0; i < len; i++) { for (var j = 0; j < len - 1 - i; i++) { // 相邻元素两两对比,元素交换 if (arr[j] > arr[j + 1]) { var temp = arr[j + 1]; arr[j + 1] = arr[j]; arr[j] = temp; } } } return arr; }
Time complexity: O(n ^2)
The most stable sorting algorithm
function selectionSort(arr) { var len = arr.length; var minIndex, temp; // 寻找最小的数,将索引保存 for (var i = 0; i < len - 1; i++) { minIndex = i; for (var j = i + 1; j < len; j++) { if (arr[j] < arr[minIndex]) { minIndex = j; } } temp = arr[i]; arr[i] = arr[minIndex]; arr[minIndex] = temp; } return arr; }
Insertion sort
Time complexity: O(n^2);
Poker sort
function insertionSort(arr) { var len = arr.length; var preIndex, current; for (var i = 1; i < len; i++) { preIndex = i - 1; current = arr[i]; while (preIndex >= 0 && arr[preIndex] > current) { arr[preIndex + 1] = arr[preIndex]; preIndex--; } arr[preIndex + 1] = current; } return arr; }
Hill Sorting
Time complexity: O(n log n);
function shellSort(arr) { var len = arr.length, temp, gap = 1; //动态定义间隔序列 while (gap < len / 3) { gap = gap * 3 + 1; } for (gap; gap > 0; gap = Math.floor(gap / 3)) { for (var i = gap; i < len; i++) { temp = arr[i]; for (var j = i - gap; j >= 0 && arr[j] > temp; j -= gap) { arr[j + gap] = arr[j]; } arr[j + gap] = temp; } } return arr; }
Merge sort
Time complexity: O(n log n);
function mergeSort(arr) { var len = arr.length; if (len < 2) { return arr; } var middle = Math.floor(len / 2), left = arr.slice(0, middle), right = arr.slice(middle); return merge(mergeSort(left), mergeSort(right)); function merge(left, right) { var result = []; while (left.length && right.length) { if (left[0] <= right[0]) { result.push(left.shift()); } else { result.push(right.shift()); } } while (left.length) result.push(left.shift()); while (right.length) result.push(right.shift()); return result; } }
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!
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