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Run results for:
char index vs charAt() vs slice() vs startsWith() vs RegExp --
Compare methods for testing string's beggining character.
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<iframe src="https://measurethat.net/Embed?id=590551" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36
Browser:
Chrome 133
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
charAt()
201.1M/s
character index
185.1M/s
startsWith()
175.6M/s
slice()
150.1M/s
RegExp
79.6M/s
View exact numbers
Test name
Executions per second
✓
charAt()
201,145,088 Ops/sec
character index
185,071,136 Ops/sec
startsWith()
175,554,720 Ops/sec
slice()
150,138,304 Ops/sec
RegExp
79,605,400 Ops/sec
Script Preparation code:
var str = '!foo bar baz'; var noop = Function.prototype;
Tests:
character index
if (str[0] === '!') noop();
charAt()
if (str.charAt(0) === '!') noop();
startsWith()
if (str.startsWith('!')) noop();
slice()
if (str.slice(0, 1) === '!') noop();
RegExp
const pattern = /^!/; if (pattern.test(str)) noop();