pick random value from associated array using javascript? [duplicate]
Possible Duplicates:
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开发者_StackOverflow! 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
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.
Here:
function fetch_random(obj) {
var temp_key, keys = [];
for(temp_key in obj) {
if(obj.hasOwnProperty(temp_key)) {
keys.push(temp_key);
}
}
return obj[keys[Math.floor(Math.random() * keys.length)]];
}
Src: How can I choose an object key at random?
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