Run results for: for-in vs object.keys isEmpty

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; Redmi Note 5 Pro) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Mobile Safari/537.36

Browser: Chrome Mobile 84

Operating system: Android

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
for-in	1687202.4 Ops/sec
Object.keys	852157.2 Ops/sec

Script Preparation code:

var obj = {
  'a': 1,
  'b': 1,
  'c': 1,
  'd': 1,
  'e': 1,
  'f': 1,
  'g': 1
};

function isEmptyFor(obj) {
  for (var key in obj) {
    return false;
  }
  return true;
}

function isEmptyObject(obj) {
  return Object.keys(obj).length === 0;
}

Tests:

for-in
isEmptyFor(obj)
Object.keys
isEmptyObject(obj)