MeasureThat.net

Run results for: for-in vs object.keys (own props)

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36
Chrome 96
Windows
Desktop
3 years ago
Test name Executions per second
for-in 2.2 Ops/sec
Object.keys 1.6 Ops/sec
Script Preparation code:
AخA
 
var obj = {
  'a': 1,
  'b': 1,
  'c': 1,
  'd': 1,
  'e': 1,
  'f': 1,
  'g': 1
};
var o1, lo1, io1, vo1, ko1, ko1s;
Tests:

  • for-in

     
    for (var i=10000; i > 0; i--) {
      for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) {
          console.log(key); 
      }}
    }

  • Object.keys

     
    for (var i=10000; i > 0; i--) {
      o1 = obj; ko1s = Object.keys(o1); lo1 = ko1s.length; for(io1=0; io1<lo1; io1++) { ko1 = ko1s[io1]; vo1 = o1[ko1];
        console.log(ko1)                                                                                   
      }
    }