Run results for: object key iteration - lodash vs native custom implementation

the custom code is basically what happens in lodash already - perhaps it's faster because lodash each has overhead deciding if something is an array or object

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36 Edg/140.0.0.0

Browser: Chrome 140

Operating system: Windows

Device Platform: Desktop

Date tested: 7 months ago

Test name	Executions per second
lodash.forEach	6004991.5 Ops/sec
custom foreach	11798779.0 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>

Script Preparation code:

var values = {a: 123, b: 234, c: 445, d: 23, e: 234, f:234, g: 345, h: 34, i: 43};
var forEachObjectKey = (object, toRun) => {
  const keys = Object.keys(object)
  let length = keys.length
  let index = -1
  while (length--) {
    index++
    toRun(keys[index], (object)[keys[index]])
  }
}

Tests:

lodash.forEach
let count = 0; _.forEach(values, (v,i) => { if (i != null) { count+= i; } })
custom foreach
let count = 0 forEachObjectKey(values, (key, value) => { if (value != null) { count += value } })

Run results for: object key iteration - lodash vs native custom implementation

the custom code is basically what happens in lodash already - perhaps it's faster because lodash each has overhead deciding if something is an array or object

lodash.forEach

custom foreach