belt loops

JavaScript performance comparison

Test case created by John Cockrell

Info

this title is just too clever by, like, half.

Preparation code

<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.3/underscore-min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/1.0.0-rc.3/lodash.min.js"></script>
<script>
var lodash = _.noConflict();
</script>
<script src="http://sjhcockrell.s3.amazonaws.com/downloads/belt.js"></script>
<script>
Benchmark.prototype.setup = function() {
    var a = [],
        b = [];
   
    for (var i = 0; i < 20; i+=1) {
        a.push(i);
    }
   
    for (var i = 0; i < 1000; i+=1 ) {
       b.push(i);
    }
   
    function MathIt(n) {
       return n % 2;
    }
   
};
</script>

Preparation code output

Test runner

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Testing in unknown unknown
Test Ops/sec
B.forIndex - a
B.forIndex(b, MathIt);
pending…
B.forEach - a
B.forEach(b, MathIt);
pending…
Underscore.forEach - a
_.forEach(b, MathIt);
pending…
lodash.forEach - a
lodash.forEach(b, MathIt);
pending…

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