Run results for: for-in vs object.keys (no console) (forked)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:82.0) Gecko/20100101 Firefox/82.0

Browser: Firefox 82

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var obj = {
  'a': 1,
  'b': 1,
  'c': 1,
  'd': 1,
  'e': 1,
  'f': 1,
  'g': 1
};

Tests:

for-in
var otherObj = {}; for (var i=10000; i > 0; i--) { for (var key in obj) { otherObj[key] = obj[key]; } }
Object.keys
var otherObj = {}; for (var i=10000; i > 0; i--) { Object.keys(obj).forEach(key => { otherObj[key] = obj[key]; }); }
Object.assign
var otherObj = {}; for (var i=10000; i > 0; i--) { otherObj = Object.assign({}, otherObj, obj); }