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  Firefox156.0 | 7.00 ms | 31.00 ms | Snippet A4.43× faster |
2nd  Safari26.6.2 | 47.00 ms | 16.00 ms | Snippet B2.94× faster |
3rd  Microsoft Edge153.0.4234.32 | 20.90 ms | 31.00 ms | Snippet A1.48× faster |
4th  Chrome153.0.8010.53 | 37.60 ms | 51.00 ms | Snippet A1.36× faster |
Median of 5 trials × 2,000,000 iterations per snippet.