Run results for: map+filter options

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 10 months ago

Test name	Executions per second
naive map + filter	442473.5 Ops/sec
manual for loop	1387733.0 Ops/sec
manual for loop fixed size result	758541.6 Ops/sec
foreach	1219165.0 Ops/sec
for of	210226.0 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 Preparation code:

var arr = (new Array(1000)).map((_, i) => i);

Tests:

naive map + filter
var result = arr.map((x) => x % 2 === 0 ? x : null).filter(x => x !== null);
manual for loop
var result = []; for (var i = 0; i < arr.length; i++) { var x = arr[i]; if (x % 2 === 0) { result.push(x); } }
manual for loop fixed size result
var result = new Array(arr.length); var next = 0; for (var i = 0; i < arr.length; i++) { var x = arr[i]; if (x % 2 === 0) { result[next++] = x; } } result = result.slice(0, next);
foreach
var result = []; arr.forEach((x) => { if (x % 2 === 0) { result.push(x); } });
for of
var result = []; for (var x of arr) { if (x % 2 === 0) { result.push(x); } }