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Run results for:
char index vs charAt() vs slice() vs at()
Compare methods for testing string's beginning character.
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<iframe src="https://measurethat.net/Embed?id=523766" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Mobile Safari/537.36
Browser:
Chrome Mobile 125
Operating system:
Android
Device Platform:
Mobile
Date tested:
2 years ago
character index
971K/s
charAt()
967K/s
slice()
966K/s
at()
951K/s
View exact numbers
Test name
Executions per second
✓
character index
970,980 Ops/sec
charAt()
967,216 Ops/sec
slice()
966,393 Ops/sec
at()
951,036 Ops/sec
Script Preparation code:
var str = 'foo bar baz'; var noop = Function.prototype;
Tests:
character index
if (str[0] === 'f') noop();
charAt()
if (str.charAt(0) === 'f') noop();
slice()
if (str.slice(0, 1) === 'f') noop();
at()
if (str.at(0) === 'f') noop();