jQuery array intersect vs native

JavaScript performance comparison

Test case created by Matt Hinchliffe

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
Benchmark.prototype.setup = function() {
    var alpha = [1, 2, 3, 4, 5, 6],
        beta = [4, 5, 6, 7, 8, 9],
        result = [];
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery
$.arrayIntersect = function(a, b)
{
    return $.grep(a, function(i)
    {
        return $.inArray(i, b) > -1;
    });
};

result = $.arrayIntersect(alpha, beta);
pending…
Native
function arrayIntersect(a, b)
{
    return a.filter(function(i)
    {
        return b.indexOf(i) > -1;
    });
}

result = arrayIntersect(alpha, beta);
pending…

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