Run results for: for-in vs object.keys vs object.values for objects without extra log

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
for-in	252.4 Ops/sec
Object.keys	318.1 Ops/sec

Script Preparation code:

function getObj(i) {
  return {
    'a': {
      id: 'a',
      num: 1
    },
    'b': {
      id: 'b',
      num: 1
    },
    'c': {
      id: 'c',
      num: 1
    },
    'd': {
      id: 'd',
      num: 1
    },
    'e': {
      id: 'e',
      num: 1
    },
    'f': {
      id: 'f',
      num: 1
    },
    'g': {
      id: 'g',
      num: 1
    },
    [i.toString()]: 1,
  };
};

Tests:

for-in
const r = []; for (var i=10000; i > 0; i--) { for (var key in getObj(i)) { r[i] = key; } } console.log(r.length)
Object.keys
const r = []; for (var i=10000; i > 0; i--) { Object.keys(getObj(i)).forEach(key => { r[i] = key; }); } console.log(r.length)

Run results for: for-in vs object.keys vs object.values for objects without extra log

for-in

Object.keys