Run results for: JS lastIndexOf vs indexOf

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:147.0) Gecko/20100101 Firefox/147.0

Browser: Firefox 147

Operating system: Linux

Device Platform: Desktop

Date tested: 6 months ago

Array.lastIndexOf

45.4M/s

Array.indexOf

11K/s

View exact numbers

Test name	Executions per second
✓ Array.lastIndexOf	45,430,460 Ops/sec
Array.indexOf	11,176 Ops/sec

Script Preparation code:

var str = '';
var i = 0;

while (i <= 1E5) str += `${i++}`;

Tests: