javascript - Sorting an Array in Random Order

Question

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);

Answer 1

You used

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

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

console.log(s);

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

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].

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);