JavaScript implementation of PHP shuffling array function shuffle instance

PHP has a handy function called shuffle() to shuffle an array, which is used in many situations, but javascript arrays don't have this method, so it doesn't matter if you don't have one.

Please refresh the page to see the effect of random sort.

<script type="text/javascript">

//<![CDATA[

//Add the shuffle method 
 to the Javascript array
 

var shuffle = function(v){

    for(var j, x, i = v.length; i; j = parseInt(Math.random() * i), x = v[--i], v[i] = v[j], v[j] = x);

    return v;

};

 

var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

 

document.write("A = ", a.join(","), "<br />shuffle(A) = ", shuffle(a));

 

//]]>

</script>

Output results:

A = 0,1,2,3,4,5,6,7,8,9
shuffle(A) = 1,5,0,9,2,3,6,8,4,7

A.shuffle() = 0,4,2,8,5,1,3,6,9,7 

Add a method to the array through prototype:

<script type="text/javascript">

//<![CDATA[

 

var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

 

if (!Array.prototype.shuffle) { 

    Array.prototype.shuffle = function() {

        for(var j, x, i = this.length; i; j = parseInt(Math.random() * i), x = this[--i], this[i] = this[j], this[j] = x);

        return this;

    };

}

 

document.write("A = ", a.join(","), "<br />A.shuffle() = ", a.shuffle());

 

//]]>

</script>