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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=575125" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36
Browser:
Chrome Mobile 131
Operating system:
Android
Device Platform:
Mobile
Date tested:
one year ago
Benchmark engine:
Benchmark.js
character index
40.4M/s
charAt()
35.6M/s
substr()
32.6M/s
slice()
32.1M/s
View exact numbers
Test name
Executions per second
✓
character index
40,448,292 Ops/sec
charAt()
35,564,212 Ops/sec
substr()
32,571,088 Ops/sec
slice()
32,072,770 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();