fyshuffle

JavaScript performance comparison

Revision 7 of this test case created by

Preparation code

``````<script>
function numberArray(a,b){
b=[];while(a--)b[a]=a+1;return b
}
var array100=numberArray(100),
array1000=numberArray(1000);

function shuffle(array) {
var currentIndex = array.length, temporaryValue, randomIndex ;
var rnd=Math.random;

// While there remain elements to shuffle...
while (0 !== currentIndex) {

// Pick a remaining element...
randomIndex = (rnd() * currentIndex)|0;
currentIndex -= 1;

// And swap it with the current element.
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}

return array;
}

function shuffleArray(array) {
var j=0, temp, rnd=Math.random;
for (var i = array.length - 1; i > 0; i--) {
j = (rnd() * (i + 1))|0;
temp = array[i];
array[i] = array[j];
array[j] = temp;
}
return array;
}

Array.prototype.shuffle = function() {
var i = this.length, j, temp;
var rnd=Math.random;
if ( i == 0 ) return this;
while ( --i ) {
j = ( rnd() * ( i + 1 ) )|0;
temp = this[i];
this[i] = this[j];
this[j] = temp;
}
return this;
}

function fy(a,b,c,d){var rnd=Math.random;
c=a.length;while(c)b=rnd()*c--|0,d=a[c],a[c]=a[b],a[b]=d
}
</script>
``````

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
fy
``````fy(array100);
fy(array1000)``````
pending…
shuffleArray
``````shuffleArray(array100);
shuffleArray(array1000)``````
pending…
shuffle prototype
``````array100.shuffle();
array1000.shuffle()``````
pending…
shuffle
``````shuffle(array100);
shuffle(array1000)``````
pending…

Revisions

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