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  Firefox159.0 | 4.00 ms | 22.00 ms | Snippet A5.50× faster |
2nd  Safari26.6.2 | 47.00 ms | 16.00 ms | Snippet B2.94× faster |
3rd  Chrome156.0.8078.80 | 23.40 ms | 25.00 ms | Snippet A1.07× faster |
4th  Microsoft Edge156.0.4314.42 |
| 26.10 ms |
| 33.40 ms |
| Snippet A1.28× faster |
Median of 5 trials × 2,000,000 iterations per snippet.
ChromeFirefoxMicrosoft EdgeSafari