Compares String.prototype.startsWith against an anchored regular expression for prefix matching.
var iterations = 2000000;0x0D
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  Safari26.5.2 | 23.00 ms | 6.00 ms | Snippet B3.83× faster |
2nd  Firefox152.0 | 7.00 ms | 32.00 ms | Snippet A4.57× faster |
3rd  Chrome150.0.7871.125 | 17.40 ms | 25.70 ms | Snippet A1.48× faster |
4th  Microsoft Edge150.0.4078.65 |
| 24.90 ms |
| 36.00 ms |
| Snippet A1.45× faster |
Median of 5 trials × 2,000,000 iterations per snippet.