Run results for: check obj empty state with for-in vs object.keys

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.166 Safari/537.36 OPR/79.0.4143.66

Browser: Opera 79

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
for-in	424666.6 Ops/sec
Object.keys	168701.7 Ops/sec

Script Preparation code:

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

Tests:

for-in
withFor()
Object.keys
withObjKeys()