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  Firefox154.0 | 6.00 ms | 27.00 ms | Snippet A4.50× faster |
1st  Safari26.5.2 | 23.00 ms | 6.00 ms | Snippet B3.83× faster |
3rd  Chrome152.0.7977.65 | 24.60 ms | 25.40 ms | Snippet A1.03× faster |
4th  Microsoft Edge152.0.4191.53 | 107.80 ms | 155.10 ms | Snippet A1.44× faster |
Median of 5 trials × 2,000,000 iterations per snippet.