convert Vec<[u8]> to JsValue

[lcnr]

I am using fetch in combination with bincode. As bincode::deserialize expects a byte array and bincode::serialize creates a byte array. To do this I currently use the following code:

let data = bincode::serialize(content).unwrap()
opts.body(Some(&JsValue::from_str(unsafe { std::str::from_utf8_unchecked(data) })));

Is there a better way to do this?

[alexcrichton]

Currently there's not a great way to do this inline in Rust, but it's covered by #811 so I'm going to close this in favor of that. Thanks for the report though!

[rylev]

@alexcrichton I have a Vec<f64> and I need a &JsValue. I believe it's not possible to do this conversion without doing the serialization trick. Am I missing something?

[alexcrichton]

@rylev I think Float64Array::view might do the trick for you?

[rylev]

I'm looking for a safe variant. I end up building a new Float64Array, coping over the floats into the new array, and then calling as_ref to get a JsValue. I wonder if it would be a good idea to have an API for doing just that (i.e., copying over a collection from the wams heap to the JS heap. Could be for any collection of T: Clone.

[alexcrichton]

I believe if you slice() just afterwards you can make a safe wrapper as that'll do a copy