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