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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=590455" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36
Browser:
Chrome 133
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
character index
137.1M/s
startsWith()
135.5M/s
charAt()
134.0M/s
slice()
104.3M/s
RegExp
49.2M/s
View exact numbers
Test name
Executions per second
✓
character index
137,095,312 Ops/sec
startsWith()
135,511,072 Ops/sec
charAt()
133,979,376 Ops/sec
slice()
104,334,640 Ops/sec
RegExp
49,156,436 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();