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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=509935" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.0
Browser:
Firefox 123
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
character index
142.8M/s
charAt()
129.1M/s
slice()
128.5M/s
at()
78.0M/s
View exact numbers
Test name
Executions per second
✓
character index
142,759,376 Ops/sec
charAt()
129,060,976 Ops/sec
slice()
128,543,288 Ops/sec
at()
78,041,960 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();