for vs map

JavaScript performance comparison

Revision 2 of this test case created

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…
reduce
a.reduce(function(acc, x) {
  return acc.concat(x.val)
}, [])
pending…
forEach
var collected = [];
a.forEach(function(x) {
  collected.push(x.val)
})
pending…

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