Object.keys vs for...in 4

JavaScript performance comparison

Revision 10 of this test case created

Preparation code

<script>    
    var obj = {
    'prop1': 'value1',
    'prop2': 'value2',
    'prop3': 'value3',
    'prop4': 'value4',
    'prop5': 'value5',
    'prop6': 'value6',
    'prop7': 'value7',
    'prop8': 'value8',
    'prop9': 'value9',
    'prop10': 'value10'
    };
</script>

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Testing in unknown unknown
Test Ops/sec
Object.keys
var keys = Object.keys(obj);
Object.keys(obj).forEach(function() {
  Date.now();
});
pending…
for...in
 for (var key in obj) {
   if (obj.hasOwnProperty(key)) {
     Date.now();
   }
 }
pending…
for ... in 2
 for (var key in obj) {
   Date.now();
 }
pending…

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