[nayuki]

    let distance = hypotenuseLength(reIndexedX, reIndexedY);
    
    function hypotenuseLength(x, y) {
      return Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
    }

The above can be replaced with:

    let distance = Math.hypot(reIndexedX, reIndexedY);

See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

[wizzwizz4]

It's a tutorial, so there's a benefit to writing out the separate function in the article, but given that it's “in JavaScript” I agree with your suggestion.

[bryanbraun]

Haha, yeah I discovered this after I wrote it. Probably worth going back and updating.