Run results for: for-in vs for-of Object.keys 2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36

Browser: Chrome 88

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
for-in	204.2 Ops/sec
for-of Object.keys	161.3 Ops/sec
for-of Object.keys includes	570.6 Ops/sec
for-of Object.keys hasOwnProperty	42.9 Ops/sec

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) { let x = key in obj; } }
for-of Object.keys
for (let i=10000; i > 0; i--) { let keys = Object.keys(obj); for (let key of keys) { let x = key in obj; } }
for-of Object.keys includes
for (let i=10000; i > 0; i--) { let keys = Object.keys(obj); for (let key of keys) { let x = keys.includes(key); } }
for-of Object.keys hasOwnProperty
for (let i=10000; i > 0; i--) { let keys = Object.keys(obj); for (let key of keys) { let x = Object.hasOwnProperty(obj, key); } }