Wait, JavaScript has the idea of minus zero?! Is there some mathematical basis for that?

Yes there are two floating point zeros.

It’s in the standard AFAIK, not just in JS.

numeric representations don't have to be unique. seems like js treats them as unified?

its similar to 1/2 = 2/4

I think === fails though.

The problem with float or double is they underflow towards zero when you make numbers too small.

i don't see how that's relevant. there's lots of strange things with float or double.

Good spot.

According to https://stackoverflow.com/questions/7223359/are-0-and-0-the-same it’s so you may have 1/-0 = -INF, 1/0 = INF if your float implementation supports that.

It was http://Object.is that fails (or succeeds), I’d forgotten which.

ah interesting

digging into a medium-sizeed plain JS React app created by someone who's not so strong on app architecture, and I 💯 understand why people clamor about typescript

things are nested 20+ levels with implicit data contracts, lots of indirection

the typescript kept this person in line or created a rats nest?

i understood that there was no typescript

ah rueing the lack of ts

I can see how having a compiler track the data contracts would ameliorate some of the pain of making changes

medium sized plain js <anything> app are loads of fun if fundamentals are missing or wrong 🙂

but in leu of good design, maybe having a tool that helps manage it is better? It's kind of a conundrum

One of my first tasks at my current job was overhauling the major sections of the app to TS. It was like cleaning out a junk drawer - the types turned up so much redundant and sometimes just wrong code. It was an extremely helpful exercise for me to understand the code base.