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Run results for:
JS Regex vs .startsWith vs .indexOf vs. slice equals
fork of https://www.measurethat.net/Benchmarks/Show/975/11/regex-vs-indexof-vs-startswith-vs-substr
Go to the benchmark
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=528605" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36
Browser:
Chrome 125
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
indexOf end
13K/s
indexOf start
13K/s
startsWith
1K/s
endsWith
1K/s
slice start equals
1K/s
slice end equals
969/s
regex start
615/s
regex end
569/s
View exact numbers
Test name
Executions per second
✓
indexOf end
13,081 Ops/sec
indexOf start
13,017 Ops/sec
startsWith
1,164 Ops/sec
endsWith
1,150 Ops/sec
slice start equals
1,018 Ops/sec
slice end equals
969 Ops/sec
regex start
615 Ops/sec
regex end
569 Ops/sec
HTML Preparation code:
<div></div>
Script Preparation code:
window.regexStart = /^test/; window.regexEnd = /test$/; window.match = 'test'; window.matchLength = window.match.length; var data = window.data = []; const possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; var TOTAL_STRINGS = window.TOTAL_STRINGS = 100000; function getRandomInt(max) { return Math.floor(Math.random() * max); } function makeRandomString(len) { var text = ""; for( var i=0; i < len; i++ ) { text += possible.charAt(getRandomInt(possible.length)); } return text; } while (data.length < TOTAL_STRINGS) { data.push(makeRandomString(getRandomInt(20))); }
Tests:
regex start
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var regex = window.regexStart; while (x < TOTAL_STRINGS) { const str = data[x]; regex.test(str); x += 1; }
startsWith
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; str.startsWith(match) === 0; x += 1; }
regex end
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var regex = window.regexEnd; while (x < TOTAL_STRINGS) { const str = data[x]; regex.test(str); x += 1; }
endsWith
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; str.startsWith(match) === 0; x += 1; }
indexOf start
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; str.indexOf(match) === 0; x += 1; }
indexOf end
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; var length = window.matchLength; while (x < TOTAL_STRINGS) { const str = data[x]; str.indexOf(match) === str.length - length; x += 1; }
slice start equals
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; var length = window.matchLength; while (x < TOTAL_STRINGS) { const str = data[x]; str.slice(0, 4) === match; x += 1; }
slice end equals
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; var length = window.matchLength; while (x < TOTAL_STRINGS) { const str = data[x]; str.slice(-4) === match; x += 1; }