WASM with ffi arrays

Hi! If I have a JS array and want to pass it to Rust/WASM and return it (modified), how do I do that? When using arrays I only get undefined. :frowning: If it helps I can my code

Does that help?

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hmm. Big thanks for your reply, @hellow! :slight_smile: But I would like to avoid wasm-bindgen. I seem to me that FFI is more small scale, more ‘light-weight’ than wasm-bindgen. Do you by any chance have and good ideas? I think it should be possible when I read the documentation, just can’t figure out how… :frowning: :slight_smile:

Wasm-bindgen should be the lightest possible thing that works.

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Ah, ok. Sorry! Did not know that. :slight_smile: I thought that it was way larger… will look into that then! Hmm… perhaps I thought that, because you can (right?) generate stuff (elements and so on) directly into the browser. This lib is only for the ‘communication’ in-between, I think. I am a bit new to this. :slight_smile: Really think it is very fun to play around with anyways! :slight_smile:

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yes, bindgen is purely for generating your own bindings between javascript and rust code;

you might have had it mixed up with web-sys which more or less wraps all web APIs using bindgen which is somewhat heavier but handy if you want to avoid writing javascript completely

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nice! thank to you both for clearing this up for me! :slight_smile:

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@hellow Hello, This does help a bit. But in my case I want to return same Vec (with transformed values) from rust (wasm) to JS.

Please start a new thread, optionally linking to this one, instead of reviving a year old thread.

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@alice Well, Not required.. I got the answer from https://rustwasm.github.io/docs/wasm-bindgen/reference/arbitrary-data-with-serde.html
Thanks!