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Run results for:
char index vs charAt() vs slice()
Compare methods for testing string's beggining character.
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<iframe src="https://measurethat.net/Embed?id=534729" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15
Browser:
Safari 17
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
charAt()
16.6M/s
slice()
16.5M/s
character index
16.4M/s
View exact numbers
Test name
Executions per second
✓
charAt()
16,575,315 Ops/sec
slice()
16,450,919 Ops/sec
character index
16,447,238 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();