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 month 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,
  };
};

AخA
 
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)

 
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)

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