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  Firefox159.0 | 4.00 ms | 5.00 ms | Snippet A1.25× faster |
2nd  Safari26.6.2 | 9.00 ms | 10.00 ms | Snippet A1.11× faster |
3rd  Chrome156.0.8078.80 | 22.70 ms | 21.10 ms | Snippet B1.08× faster |
4th  Microsoft Edge156.0.4314.42 | 26.40 ms | 26.30 ms | Snippet B |
Median of 5 trials × 2,000,000 iterations per snippet.
ChromeFirefoxMicrosoft EdgeSafari