Run results for: char index vs charAt() vs RegExp

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Browser: Chrome 84

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
charAt()	3959420.8 Ops/sec
RegExp	3243325.0 Ops/sec

Tests:

charAt()
let str = '!foo bar baz'; let noop = Function.prototype; if (str.charAt(0) === '!') noop();
RegExp
let str = '!foo bar baz'; let noop = Function.prototype; const pattern = /^!/; if (pattern.test(str)) noop();