Run results for: native reverse find vs native array findLast vs for loop find

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:148.0) Gecko/20100101 Firefox/148.0

Browser: Firefox 148

Operating system: Linux

Device Platform: Desktop

Date tested: 3 months ago

for loop

1063.9M/s

array findlast

28.6M/s

array find

21.1M/s

View exact numbers

Test name	Executions per second
✓ for loop	1,063,910,464 Ops/sec
array findlast	28,614,752 Ops/sec
array find	21,133,500 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': 'joey',  'age': 32 },
  { 'user': 'ross',    'age': 41 },
  { 'user': 'joey',  'age': 32 },
  { 'user': 'ross',    'age': 41 },
  { '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 < 40; })
array findlast
users.slice().findLast(function (o) { return o.age < 40; })
for loop
let lastItem = undefined; for (let i = users.length - 1; i >= 0; i--) { if (users[i].age < 40) { lastItem = users[i]; break; // Exit the loop once the item is found } }

Run results for: native reverse find vs native array findLast vs for loop find

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

array find

array findlast

for loop