Question

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JavaScript: Getting random value from an array
How can I choose an object key at random?

suppose we have an array like this:

var MrArray = new Array(5);
MrArray['one']='oneValue';
MrArray['two']='twoValue';
MrArray['three']='threeValue';
MrArray['four']='fourValue';
MrArray['five']='fiveValue';

ok?
the Array is associated.
and we have string key and string value.
now! how can i pick a random value from that?
Edit:i want to use like this:

<A href="Array value Here">Array Key Here</a>

Regards
Sam

Answer 1

Using the method described here we can create the following function:

function randomKey(obj) {
    var ret;
    var c = 0;
    for (var key in obj)
        if (Math.random() < 1/++c)
           ret = key;
    return ret;
}

It returns a random key, so to get a random value from MrArray, do this:

var value = MrArray[randomKey(MrArray)];

jsPerf benchmark comparing the speed of this and the other answer.