belt difference fn

JavaScript performance comparison

Test case created by John Cockrell

Preparation code

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

Preparation code output

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

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