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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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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=596766" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Mobile Safari/537.36
Browser:
Chrome Mobile 134
Operating system:
Android
Device Platform:
Mobile
Date tested:
one year ago
charAt()
62.9M/s
character index
61.9M/s
slice()
53.1M/s
at()
43.3M/s
View exact numbers
Test name
Executions per second
✓
charAt()
62,917,224 Ops/sec
character index
61,872,456 Ops/sec
slice()
53,101,828 Ops/sec
at()
43,317,256 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();