Run results for: charCodeAt vs charAt

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 26_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/152.0.7977.112 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 152

Operating system: iOS 26.6.1

Device Platform: Mobile

Date tested: 5 days ago

Benchmark engine: Benchmark.js

charCodeAt

64.4M/s

use []

41.2M/s

charAt

21.8M/s

View exact numbers

Test name	Executions per second
✓ charCodeAt	64,355,564 Ops/sec
use []	41,165,004 Ops/sec
charAt	21,755,770 Ops/sec

Script Preparation code:

var a = "abcdefghijklmnopqrstuvwxyz"
var b = "x"
var c = b.charCodeAt(0)

Tests:

charAt
for(let i = 0; i < a.length; ++i) { if(a.charAt(i) == b) break; }
charCodeAt
for(let i = 0; i < a.length; ++i) { if(a.charCodeAt(i) == c) break; }
use []
for(let i = 0; i < a.length; ++i) { if(a[i] == b) break; }