Accessing JS arrays from Rust

[koute]

Accessing JS arrays from Rust

[koute]

You can convert either a Value or an Array into a Vec<T> using the TryFrom trait (Specifically this and this impl.)

This should work:

let array: Vec< String > = js! { return ["foo", "bar"]; }.try_into().unwrap();

You can't currently access a JavaScript array in Rust without converting it to a vector first.

[TilBlechschmidt]

Thanks for the quick answer!

I wasn't aware of the .try_into() function! Looks good.

The above error seems to persist though:

error[E0277]: the trait bound `std::vec::Vec<std::string::String>: std::convert::From<stdweb::Value>` is not satisfied
  --> src/main.rs:25:63
   |
25 |     let array: Vec< String > = js! { return ["foo", "bar"]; }.try_into().unwrap();
   |                                                               ^^^^^^^^ the trait `std::convert::From<stdweb::Value>` is not implemented for `std::vec::Vec<std::string::String>`
   |
   = help: the following implementations were found:
             <std::vec::Vec<stdweb::Value> as std::convert::From<&'a stdweb::Array>>
             <std::vec::Vec<u8> as std::convert::From<&'a stdweb::web::TypedArray<u8>>>
             <std::vec::Vec<stdweb::Value> as std::convert::From<&'a mut stdweb::Array>>
             <std::vec::Vec<stdweb::Value> as std::convert::From<stdweb::Array>>
           and 10 others
   = note: required because of the requirements on the impl of `std::convert::TryFrom<stdweb::Value>` for `std::vec::Vec<std::string::String>`
   = note: required because of the requirements on the impl of `std::convert::TryInto<std::vec::Vec<std::string::String>>` for `stdweb::Value`

Seems like I am missing a piece of the puzzle there ...

[koute]

You're using the wrong TryFrom. (:

The std::convert::TryFrom is still unstable, so we have our own in stdweb::unstable::TryFrom/stdweb::unstable::TryInto.

[TilBlechschmidt]

That did the trick!
Thanks for your swift help 😃

This might as well be the next big thing for Rust ;)
Props to you good sir and this project! Keep up the amazing work!

[koute]

No problem; thanks. (: