[GreedCtrl]

Determinism! [0] I'm switching a browser game side project from Typescript to WebAssembly because determinism enables a simpler style of multiplayer. Instead of relying on a server to manage state, I can just send inputs p2p like a modern fighting game (with rollback [1]). Then the game acts just like singleplayer! For a hobbyist like me, WebAssembly makes the minefield of multiplayer so much easier to navigate.

[0]: https://github.com/WebAssembly/design/blob/master/Nondetermi... [1] A blog post on rollback netcode (not in wasm): https://ki.infil.net/w02-netcode.html

[Jasper_]

What's nondeterministic about TypeScript / JavaScript?

[steveklabnik]

Performance. See the graphs here: https://fitzgeraldnick.com/2018/02/26/speed-without-wizardry...

Look how much spread there is in the JS, and how little there is in the wasm.

Depending on what you're doing, this may or may not matter to you.

[lifthrasiir]

Object enumeration order (before ES2020 [1]), math function accuracy (Firefox and Chrome did standardize on fdlibm though [2]), various timings. All of them can be fixed with caution but it might be easier to use a platform where none of them matters (well, as long as you don't import Math.sin etc. from the environment...).

[1] https://stackoverflow.com/a/30919039/225272

[2] https://www.linux.com/training-tutorials/math-v8-broken-how-...