Benchmark: for-in vs for-in hasOwnProperty vs object.keys forEach

Script Preparation code:

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

Tests:

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

Rendered benchmark preparation results:

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Related benchmarks:

for-in vs for-in hasOwnProperty vs object.keys forEach (version: 0)