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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 OPR/110.0.0.0 (Edition Yx 05)

Browser: Opera 110

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

for-in

8.4M/s

Object.keys

4.5M/s

View exact numbers

Test name	Executions per second
✓ for-in	8,403,156 Ops/sec
Object.keys	4,494,202 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)