Run results for: _.chain then reduce vs for

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.2 Safari/605.1.15

Browser: Safari 14

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Lodash reduce	10039.7 Ops/sec
Native reduce	3212.6 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var users = {}

for (var i = 0; i < 1000; i++) {
  if (i % 2) {
 	users[i] = {a: "a", b: "b"}
  } else {
 	users[i] = {b: "b"}
  } 
}

Tests:

Lodash reduce
var res = _.chain(users) .reduce((acc, a, userID) => { if (a === "a") { acc.push(userID) } return acc }, []) .value()
Native reduce
var res = [] for (key in users) { if (users[key].a) res.push(key) }