Compares String.prototype.startsWith against an anchored regular expression for prefix matching.
var iterations = 2000000;
var s = "hello world";s.startsWith("hello")/^hello/.test(s)s.startsWith("hello")/^hello/.test(s)s.startsWith("hello")/^hello/.test(s)
| Browser | Snippet A | Snippet B | Winner |
|---|---|---|---|
1st  Firefox157.0 | 10.00 ms | 47.00 ms | Snippet A4.70× faster |
2nd  Microsoft Edge154.0.4258.37 | 12.60 ms | 21.50 ms | Snippet A1.71× faster |
3rd  Safari26.6.2 | 47.00 ms | 16.00 ms | Snippet B2.94× faster |
4th  Chrome154.0.8037.95 |
| 21.30 ms |
| 23.50 ms |
| Snippet A1.10× faster |
Median of 5 trials × 2,000,000 iterations per snippet.