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What's stopping WebAssembly from effectively replacing JavaScript? (self.programming)

submitted 1 year ago by popcar2 to c/programming

54 comments fedilink hide all child comments

I've been wondering about this for a while and haven't really found a great answer for it. From what I understand, WASM is:

Faster than JavaScript
Has a smaller file size
Can be compiled to from pretty much any programming language
Can be used outside of the browser easier thanks to WASI

So why aren't most websites starting to try replacing (most) JS with WASM now that it's supported by every major browser? The most compelling argument I heard is that WASM can't manipulate the DOM and a lot of people don't want to deal with gluing JS code to it, but aside from that, is there something I'm missing?

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[–] jim_stark 3 points 1 year ago (1 children)

What about maintainability of large code bases? JS even with TS tacked isn't so great or at least not as good as Rust.

[–] nous 3 points 1 year ago (1 children)

Yes, that is a good reason to use languages like rust overall. And one reason we are seeing quite a few web frontend frameworks being written in rust now. They are maturing quite fast and there is quite a bit of effort being put into them. But i believe most of this is coming from rust devs (that may have touched frontend tech before) wanting to use it in more places rather than JS devs wanting something more maintainable.

There is quite a lot you can do in languages like JS to help mitigate the maintainability issues as projects scale up in it. TS is one such thing that helps quite a lot and when employed well improves things quite a lot - enough of a difference that it makes the jump to a completely different language and tooling that moving to rust would involve become less attractive. There is still benefit of rust over TS, but also a much bigger cost than switching from JS to TS.

Some will see the switch as worth it, though more for newer/greenfield projects. Or those coming from backend already written in rust and thus already familiar with the language. Over time these types of projects and situations will grow - but that happens very slowly over time and not just because some line gets crossed by the technology. It also wont cause it to take over everything, but will just get a small market share of everything being written now.

This is also why we have so many different backend languages rather than one that everyone uses. If one language cannot take over that why would it work for the frontend? At best more websites will start suing other languages over time and slowly erode JSs market share in the web frontend space.

[–] jim_stark 1 points 1 year ago

Interesting take!