aarontgrogg Array.filter vs for-loop

JavaScript performance comparison

Revision 3 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 items = 100000;
   
    var sidekicks = [];
   
    for (var i = 0; i < (items / 4); i++) {
      sidekicks = sidekicks.concat([{
        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
var batKicks = sidekicks.filter(function(el) {
  return (el.hero === "Batman");
});
pending…
for loop
var batKicks = [];

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

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Revisions

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