Run results for: regex vs startWith

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0

Browser: Chrome 141

Operating system: Windows

Device Platform: Desktop

Date tested: 9 months ago

startWith

16K/s

regex

10K/s

View exact numbers

Test name	Executions per second
✓ startWith	16,254 Ops/sec
regex	10,270 Ops/sec

Script Preparation code:

var foo = ['+++', '---', '===', '@@@', null, undefined, '', 'foo'];
var test = [];

for (var i = 0; i < 1000; i++) {
  test = [...test, ...foo];
}

Tests:

regex
test.map((x) => /^\+\-\=\@/.test(x) ? "'" + x : x);
startWith
test.map((x) => { if ( x?.startsWith('+') || x?.startsWith('-') || x?.startsWith('=') || x?.startsWith('@') ) { return "'" + x; } return x; });