Object keys iteration

JavaScript performance comparison

Revision 18 of this test case created

Info

Testing Object.keys vs for-in. I see that SlickGrid uses objects with indexed keys rather than arrays. Confused....

Preparation code

<script>
  var data = {};
 
  for (var i = 0; i < 10; i++) {
 
   data[i] =  'user ' + i;
 
  }
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
for-in
for (var key in data) {
   if (Object.prototype.hasOwnProperty.call(data, key)) {
      data[key];
   }
}
pending…
for-in-cached-hasOwnProperty
var ownProp = Object.prototype.hasOwnProperty;
for (var key in data) {
   if (ownProp.call(data, key)) {
      data[key];
   }
}
pending…
for-in-no-hasOwnProperty
for (var key in data) {
    data[key];
}
pending…
object-keys 3
var keys = Object.keys(data);
var len = keys.length;
var i;

for (i = 0; i < len; ++i) {
  data[keys[i]];
}
pending…

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