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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=517727" 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/119.0.0.0 Safari/537.36
Browser:
Chrome 119
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
slice()
15.1M/s
character index
14.9M/s
at()
14.8M/s
charAt()
14.7M/s
View exact numbers
Test name
Executions per second
✓
slice()
15,107,826 Ops/sec
character index
14,855,369 Ops/sec
at()
14,779,117 Ops/sec
charAt()
14,740,848 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();