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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=552597" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 17
Operating system:
iOS 17.5
Device Platform:
Mobile
Date tested:
one year ago
character index
17.0M/s
charAt()
16.6M/s
slice()
16.3M/s
View exact numbers
Test name
Executions per second
✓
character index
16,984,842 Ops/sec
charAt()
16,620,041 Ops/sec
slice()
16,311,726 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();