以随机顺序对数组进行排序 [英] Sorting an Array in Random Order

问题描述

我试图了解以随机顺序对数组进行排序的工作原理.所以，我找到了以下代码:

I'm trying to understand how sorting an array in random order works. So, I found the following code:

var as = ["max","jack","sam"];  
var s = as.sort(func);  

function func(a, b) {  
  return 0.5 - Math.random();
}  

console.log(s);

我的主要问题是为什么他们使用0.5 而不是另一个数字?以及它是如何工作的

my main question is why they use 0.5 not another number? and how it really works

推荐答案

你用过

var as = ["max","jack","sam"];  
var s = as.sort(func);  

function func(a, b) {  
  return 0.5 - Math.random();
}  

console.log(s);

而且这里最重要的事情是as.sort(func).
func(a,b) 将返回 [-0.5,0.5] 范围内的值.

And here the most important thing is as.sort(func).
func(a,b) will return value in range of [-0.5,0.5].

因为这个函数返回0.5 - Math.random() 而Math.random() 将返回[0,1].
这样您的 func 将返回 [-0.5,0.5] 范围内的值.

Because this function return 0.5 - Math.random() and Math.random() will return the float value which is in range of [0,1].
So that your func will return value in range of [-0.5,0.5].

这意味着排序顺序将设置为increase 或decrease.这是随机的.所以你的结果将是随机的

And this mean that sort order will be set increase or decrease. this is random. So your result will be random

var as = ["max","jack","sam"];  
var s = as.sort(func);  

function func(a, b) {  
  return Math.random();
}  

console.log(s);

var as = ["max","jack","sam"];  
var s = as.sort(func);  

function func(a, b) {  
  return 0 - Math.random();
}  

console.log(s);

var as = ["max","jack","sam"];  
var s = as.sort(func);  

function func(a, b) {  
  return 0.5 - Math.random();
}  

console.log(s);

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