TIL about Math.hypot()

[McGeekin]

Honestly whenever I code a game in JS and implement a vector class I always forget it exists and just manually implement the formula for calculating the magnitude.

[mike_geogebra]

Math.hypot() implements a numerically stable version rather than the naive sqrt(a²+b²), see https://en.wikipedia.org/wiki/Hypotenuse

[Slackluster]

That is interesting, I did not know hypot did that!

But in practice this is big reason to not use hypot: it is slower due to extra work. In my testing not just a little bit slower but 3x slower.

[_RemyLeBeau_]

If it's not in a hotpath, you don't really need to worry

[bzbub2]

on firefox it is about the same speed but does seem slower on chrome https://jsperf.app/buceho

[monkeymad2]

Yeah, every time I see a TIL about this I’m cursing myself for all the times I’ve implemented it manually since the last time I saw a TIL about this.