for vs map

JavaScript performance comparison

Test case created by Ken

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var a = [];
    for(var i = 1000; i--;) {
      a.push({ val: i });
    }
};
</script>

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Testing in unknown unknown
Test Ops/sec
for
var collected = [];
for(var i = a.length; i--;) {
  collected.push(a[i].val);
}
pending…
map
a.map(function(obj) {
  return obj.val;
})
pending…

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