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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=602126" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:137.0) Gecko/20100101 Firefox/137.0
Browser:
Firefox 137
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
character index
93.7M/s
slice()
89.5M/s
charAt()
89.0M/s
View exact numbers
Test name
Executions per second
✓
character index
93,731,280 Ops/sec
slice()
89,510,768 Ops/sec
charAt()
89,014,920 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();