Compares String.prototype.indexOf against String.prototype.includes for substring searches.
var iterations = 2000000;
var s = "hello world";s.indexOf("world") !== -1s.includes("world")s.indexOf("world") !== -1s.includes("world")s.indexOf("world") !== -1s.includes("world")| Browser | Snippet A | Snippet B | Winner |
|---|---|---|---|
1st  Firefox156.0 | 6.00 ms | 6.00 ms | Tie |
2nd  Microsoft Edge153.0.4234.32 | 6.60 ms | 6.80 ms | Snippet A1.03× faster |
3rd  Safari26.6.2 | 9.00 ms | 10.00 ms | Snippet A1.11× faster |
4th  Chrome153.0.8010.53 | 42.40 ms | 41.50 ms |
| Snippet B1.02× faster |
Median of 5 trials × 2,000,000 iterations per snippet.