Run results for: .startsWith() vs. RegExp for short strings and short prefixes

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 25 days ago

Test name	Executions per second
.startsWith()	11413.1 Ops/sec
RegExp	159610.1 Ops/sec

Script Preparation code:

const regexp = new RegExp(/^\-\-/);
const prefix = "--";
const str = "--some-var";
const numTests = 10000;

AخA
 
const regexp = new RegExp(/^\-\-/);const prefix = "--";const str = "--some-var";const numTests = 10000;

Tests:

let i = 0;
while (i < numTests) {
  	str.startsWith(prefix);
	i++;
}

​x
 
let i = 0;while (i < numTests) {    str.startsWith(prefix);    i++;}​

let i = 0;
while (i < numTests) {
  	regexp.test(str);
	i++;
}

 
let i = 0;while (i < numTests) {    regexp.test(str);    i++;}​