Run results for: native reverse find vs lodash _.findLast larger sample

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

array find

4.5M/s

_.findLast

2.2M/s

View exact numbers

Test name	Executions per second
✓ array find	4,541,406 Ops/sec
_.findLast	2,197,754 Ops/sec

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.core.js"></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var users = [
  { 'user': 'joey',  'age': 32 },
  { 'user': 'ross',    'age': 41 },
  { 'user': 'chandler', 'age': 39 },
    { 'user': 'joey',  'age': 32 },
  { 'user': 'ross',    'age': 41 },
  { 'user': 'chandler', 'age': 39 },
    { 'user': 'joey',  'age': 32 },
  { 'user': 'rachel',    'age': 25 },
  { 'user': 'chandler', 'age': 39 },
    { 'user': 'joey',  'age': 32 },
  { 'user': 'ross',    'age': 41 },
  { 'user': 'chandler', 'age': 39 },
    { 'user': 'joey',  'age': 32 },
  { 'user': 'ross',    'age': 41 },
  { 'user': 'chandler', 'age': 39 },
    { 'user': 'joey',  'age': 32 },
  { 'user': 'ross',    'age': 41 },
  { 'user': 'chandler', 'age': 39 }
]

Tests:

array find
// Native users.slice().reverse().find(function (o) { return o.age < 30; })
_.findLast
_.findLast(users, function (o) { return o.age < 30; })

Run results for: native reverse find vs lodash _.findLast larger sample

Compare the new ES6 spread operator with the traditional concat() method

array find

_.findLast