MeasureThat.net

Run results for: for-in hasOwnProperty vs object.keys test vs for-in

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
Chrome 105
Windows
Desktop
2 years ago
Test name Executions per second
for-in hasOwnProperty 3.3 Ops/sec
Object.keys 3.1 Ops/sec
for-in 4.0 Ops/sec
Script Preparation code:
AخA
 
var obj = {
  'a': 1,
  'b': 1,
  'c': 1,
  'd': 1,
  'e': 1,
  'f': 1,
  'g': 1
};
Tests:

  • for-in hasOwnProperty

     
    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--) {
      Object.keys(obj).forEach(key => console.log(key));
    }

  • for-in

     
    for (var i=10000; i > 0; i--) {
      for (var key in obj) {
        console.log(key); 
      }
    }