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Run results for:
JS array lastIndexOf vs indexOf
JS array lastIndexOf vs indexOf
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Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36
Browser:
Chrome 144
Operating system:
Linux
Device Platform:
Desktop
Date tested:
3 months ago
Test name
Executions per second
Array.lastIndexOf
64695.6 Ops/sec
Array.indexOf
276857.9 Ops/sec
Script Preparation code:
var a = []; var i = 0; while (i <= 1E5) { i++; // Put the two results same disance from start and end if(i === 1E5 - 1E4 || i === 1E4) str.push("match") else a.push(i) }
Tests:
Array.lastIndexOf
const item = a.lastIndexOf("match");
Array.indexOf
const index = a.indexOf("match");