aarontgrogg Array.filter vs for-loop

JavaScript performance comparison

Revision 5 of this test case created

Info

Comparing the native Array.filter to a loop, based on this article: http://designpepper.com/blog/drips/filtering-arrays-with-array-filter

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var sidekicks = [{
      name: "Robin",
      hero: "Batman"
    }, {
      name: "Supergirl",
      hero: "Superman"
    }, {
      name: "Oracle",
      hero: "Batman"
    }, {
      name: "Krypto",
      hero: "Superman"
    }];
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Array.filter
function filterFn(el) { return (el.hero === "Batman"); }

var batKicks = sidekicks.filter(filterFn);
pending…
for loop
var batKicks = [];

for (var i = 0; i < sidekicks.length; i++) {
  var tmp = sidekicks[i];
  if (tmp.hero === "Batman" || tmp.hero === "Nanana" || tmp.hero === "Robin") {
    batKicks.push(tmp);
  }
}
pending…

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