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Detailed explanation of the differences between various js sorting methods and sort methods
- 小云云Original
- 2018-01-05 17:55:231839browse
I had a sudden thought today and wanted to know whether the sort method has advantages over various sortings. This article mainly shares with you the difference between various sorting methods and sort methods based on js (detailed explanation), which has a good reference value. I hope to be helpful. Let’s follow the editor to take a look, I hope it can help everyone.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=0">
<title>图片列表生成交互组件</title>
<style>
* {
margin: 0;
border: 0;
}
html, body {
height: 100%;
}
#p {
height: 100%;
width: 100%;
}
</style>
</head>
<body>
<p id="p"></p>
<script src="myNeedExtend.js"></script>
<script>
// ---------- 一些排序算法
Sort = {
// 利用sort进行排序
systemSort:function(array){
return array.sort(function(a, b){
return a - b;
});
},
// 冒泡排序
bubbleSort:function(array){
var i = 0, len = array.length,
j, d;
for(; i<len; i++){
for(j=0; j<len; j++){
if(array[i] < array[j]){
d = array[j];
array[j] = array[i];
array[i] = d;
}
}
}
return array;
},
// 快速排序
quickSort:function(array){
//var array = [8,4,6,2,7,9,3,5,74,5];
//var array =[0,1,2,44,4,324,5,65,6,6,34,4,5,6,2,43,5,6,62,43,5,1,4,51,56,76,7,7,2,1,45,4,6,7];
var i = 0;
var j = array.length - 1;
var Sort = function(i, j){
// 结束条件
if(i == j ){ return };
var key = array[i];
var tempi = i; // 记录开始位置
var tempj = j; // 记录结束位置
while(j > i){
// j <<-------------- 向前查找
if(array[j] >= key){
j--;
}else{
array[i] = array[j]
//i++ ------------>>向后查找
while(j > ++i){
if(array[i] > key){
array[j] = array[i];
break;
}
}
}
}
// 如果第一个取出的 key 是最小的数
if(tempi == i){
Sort(++i, tempj);
return ;
}
// 最后一个空位留给 key
array[i] = key;
// 递归
Sort(tempi, i);
Sort(j, tempj);
}
Sort(i, j);
return array;
},
// 插入排序
insertSort:function(array){
// http://baike.baidu.com/image/d57e99942da24e5dd21b7080
// http://baike.baidu.com/view/396887.htm
// var array = [0,1,2,44,4,324,5,65,6,6,34,4,5,6,2,43,5,6,62,43,5,1,4,51,56,76,7,7,2,1,45,4,6,7];
var i = 1, j, temp, key, len = array.length;
for(; i < len; i++){
temp = j = i;
key = array[j];
while(--j > -1){
if(array[j] > key){
array[j+1] = array[j];
}else{
break;
}
}
array[j+1] = key;
}
return array;
},
// 希尔排序
shellSort:function(array){
// http://zh.wikipedia.org/zh/%E5%B8%8C%E5%B0%94%E6%8E%92%E5%BA%8F
// var array = [13,14,94,33,82,25,59,94,65,23,45,27,73,25,39,10];
// var tempArr = [1750, 701, 301, 132, 57, 23, 10, 4, 1];
// reverse() 在维基上看到这个最优的步长 较小数组
var tempArr = [1031612713, 217378076, 45806244, 9651787, 2034035, 428481, 90358, 19001, 4025, 836, 182, 34, 9, 1];
//针对大数组的步长选择
var i = 0;
var tempArrLength = tempArr.length;
var len = array.length;
var len2 = parseInt(len/2);
for(;i < tempArrLength; i++){
if(tempArr[i] > len2){
continue;
}
tempSort(tempArr[i]);
}
// 排序一个步长
function tempSort(temp){
//console.log(temp) 使用的步长统计
var i = 0, j = 0, f, tem, key;
var tempLen = len%temp > 0 ? parseInt(len/temp) + 1 : len/temp;
for(;i < temp; i++){// 依次循环列
for(j=1;/*j < tempLen && */temp * j + i < len; j++){
//依次循环每列的每行
tem = f = temp * j + i;
key = array[f];
while((tem-=temp) >= 0){
// 依次向上查找
if(array[tem] > key){
array[tem+temp] = array[tem];
}else{
break;
}
}
array[tem + temp ] = key;
}
}
}
return array;
}
};
testArrs = [];
for (var i = 10000000; i > 0; i--) {
testArrs.push(i);
}
function test(fun,arr) {
console.log(arr);
var oldTime = +new Date();
var new_arr = Sort[fun](arr);
var newTime = +new Date();
console.log(new_arr);
console.log(newTime-oldTime);
}
/*
* sort排序 systemSort
* 冒泡排序 bubbleSort
* 快速排序 quickSort
* 插入排序 insertSort
* 希尔排序 shellSort
*
* */
test("systemSort",testArrs);
</script>
</body>
</html>
The above method passes the test time, and then analyzes which sorting method saves time. Time is life. Using the correct method can save a lot of time, especially when big data is running.
First look at the time it takes to process an array of 10,000 lengths:
* sort sorting systemSort 11
* bubble sorting bubbleSort 169
* quick sorting quickSort 144
* Insertion sorting insertSort 139
* Hill sorting shellSort 3
Test 100,000-long array data:
* sort sorting systemSort 63
* Bubble sorting bubbleSort 16268
* Quick sort quickSort reports an error directly
* Insertion sort insertSort 13026
* Hill sort shellSort 8
Test an array with a length of one million:
* sort sorting systemSort 575
* Bubble sort bubbleSort time is unknown
* Quick sort quickSort reports an error directly
* Insertion sort insertSort crashes directly
* Hill sort shellSort 93
Test 10 million long Array:
* sort sorting systemSort 7039
* Bubble sort bubbleSort not tested
* quick sort quickSort not tested
* insertion sort insertSort not tested
* Hill sorting shellSort 1225
Testing an array of 100 million long:
* sort sorting systemSort crashes directly
* Bubble sort bubbleSort not tested
* Quick sort quickSort not tested
* Insertion sort insertSort Not tested
* Hill sorting shellSort 19864
Finally passed the test. In the worst case, it was found that Hill sorting is still the best, and it is even faster than the system sorting. It is really surprising. In this way, everyone can see what method needs to be used for sorting under what circumstances, right?
Then we test in random situations:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=0">
<title>图片列表生成交互组件</title>
<style>
* {
margin: 0;
border: 0;
}
html, body {
height: 100%;
}
#p {
height: 100%;
width: 100%;
}
</style>
</head>
<body>
<p id="p"></p>
<script src="myNeedExtend.js"></script>
<script>
// ---------- 一些排序算法
Sort = {
// 利用sort进行排序
systemSort:function(array){
return array.sort(function(a, b){
return a - b;
});
},
// 冒泡排序
bubbleSort:function(array){
var i = 0, len = array.length,
j, d;
for(; i<len; i++){
for(j=0; j<len; j++){
if(array[i] < array[j]){
d = array[j];
array[j] = array[i];
array[i] = d;
}
}
}
return array;
},
// 快速排序
quickSort:function(array){
//var array = [8,4,6,2,7,9,3,5,74,5];
//var array =[0,1,2,44,4,324,5,65,6,6,34,4,5,6,2,43,5,6,62,43,5,1,4,51,56,76,7,7,2,1,45,4,6,7];
var i = 0;
var j = array.length - 1;
var Sort = function(i, j){
// 结束条件
if(i == j ){ return };
var key = array[i];
var tempi = i; // 记录开始位置
var tempj = j; // 记录结束位置
while(j > i){
// j <<-------------- 向前查找
if(array[j] >= key){
j--;
}else{
array[i] = array[j]
//i++ ------------>>向后查找
while(j > ++i){
if(array[i] > key){
array[j] = array[i];
break;
}
}
}
}
// 如果第一个取出的 key 是最小的数
if(tempi == i){
Sort(++i, tempj);
return ;
}
// 最后一个空位留给 key
array[i] = key;
// 递归
Sort(tempi, i);
Sort(j, tempj);
}
Sort(i, j);
return array;
},
// 插入排序
insertSort:function(array){
// http://baike.baidu.com/image/d57e99942da24e5dd21b7080
// http://baike.baidu.com/view/396887.htm
// var array = [0,1,2,44,4,324,5,65,6,6,34,4,5,6,2,43,5,6,62,43,5,1,4,51,56,76,7,7,2,1,45,4,6,7];
var i = 1, j, temp, key, len = array.length;
for(; i < len; i++){
temp = j = i;
key = array[j];
while(--j > -1){
if(array[j] > key){
array[j+1] = array[j];
}else{
break;
}
}
array[j+1] = key;
}
return array;
},
// 希尔排序
shellSort:function(array){
// http://zh.wikipedia.org/zh/%E5%B8%8C%E5%B0%94%E6%8E%92%E5%BA%8F
// var array = [13,14,94,33,82,25,59,94,65,23,45,27,73,25,39,10];
// var tempArr = [1750, 701, 301, 132, 57, 23, 10, 4, 1];
// reverse() 在维基上看到这个最优的步长 较小数组
var tempArr = [1031612713, 217378076, 45806244, 9651787, 2034035, 428481, 90358, 19001, 4025, 836, 182, 34, 9, 1];
//针对大数组的步长选择
var i = 0;
var tempArrLength = tempArr.length;
var len = array.length;
var len2 = parseInt(len/2);
for(;i < tempArrLength; i++){
if(tempArr[i] > len2){
continue;
}
tempSort(tempArr[i]);
}
// 排序一个步长
function tempSort(temp){
//console.log(temp) 使用的步长统计
var i = 0, j = 0, f, tem, key;
var tempLen = len%temp > 0 ? parseInt(len/temp) + 1 : len/temp;
for(;i < temp; i++){// 依次循环列
for(j=1;/*j < tempLen && */temp * j + i < len; j++){
//依次循环每列的每行
tem = f = temp * j + i;
key = array[f];
while((tem-=temp) >= 0){
// 依次向上查找
if(array[tem] > key){
array[tem+temp] = array[tem];
}else{
break;
}
}
array[tem + temp ] = key;
}
}
}
return array;
}
};
testArrs = [];
for (var i = 0; i < 10000000; i++) {
testArrs.push(Math.random());
}
function test(fun,arr) {
var oldTime = +new Date();
var new_arr = Sort[fun](arr);
var newTime = +new Date();
console.log(fun);
console.log(newTime-oldTime);
}
/*
* sort排序 systemSort
* 冒泡排序 bubbleSort
* 快速排序 quickSort
* 插入排序 insertSort
* 希尔排序 shellSort
*
* */
test("systemSort",testArrs);
//test("bubbleSort",testArrs);
//test("quickSort",testArrs);
test("insertSort",testArrs);
test("shellSort",testArrs);
</script>
</body>
</html>
Test a 10 million-long array:
* sort sorting systemSort 8842
* Bubble sorting bubbleSort not tested
* quick sort quickSort not tested
* insertion sort insertSort 45
* Hill sorting shellSort 1133
In unknown situations and relatively good situations, insertion sort is most efficient
Related recommendations:
Summary of PHP array sorting method
Detailed explanation of the use of sorting methods in javascript algorithms
Introduction to php array functions and summary of array sorting methods
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