Run results for: array vs charAt vs startsWith

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 14

Operating system: iOS 14.2.1

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
array	3738140.8 Ops/sec
charAt	3724521.0 Ops/sec
startsWith	3107950.2 Ops/sec

Script Preparation code:

var myStr = '!foo bar baz';
var noop = Function.prototype;

Tests:

array
if (myStr[0] === '!') noop();
charAt
if (myStr.charAt(0) === '!') noop();
startsWith
if (myStr.startsWith('!')) noop();