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Run results for:
char index vs charAt() vs slice() vs substr()
Compare methods for testing string's beggining character.
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=593521" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Browser:
Chrome 134
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
charAt()
48.6M/s
character index
48.2M/s
substr()
41.6M/s
slice()
40.7M/s
View exact numbers
Test name
Executions per second
✓
charAt()
48,605,420 Ops/sec
character index
48,241,808 Ops/sec
substr()
41,635,744 Ops/sec
slice()
40,730,904 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();
substr()
if (str.substr(0, 1) == 'f') noop();