Wasm-bindgen: Port our examples to Rust 2018 edition!

[fitzgen]

Let's port our examples to the 2018 edition!

How to port an example crate

1. Leave a comment here claiming an example, so that we don't duplicate work.
2. Run cargo fix --edition
3. Add edition = "2018" to the [package] section of the example's Cargo.toml
4. Run cargo check --target wasm32-unknown-unknown
   
   
   
   • If it compiles OK and without any warnings:
     
     
     
     
     
     • commit your changes and send a PR!
     
     
     
   
   
   • Otherwise:
     
     
     
     
     
     • trouble shoot, fix any errors and warnings, go back to the start of step 4.
     
     
     
   
   
5. (optional) Run cargo fix --edition-idioms and remove all extern crate directives

The 2018 edition guide might be helpful reading.

TODO

• [x] examples/add/
• [x] examples/canvas/
• [x] examples/char/
• [x] examples/closures/
• [x] examples/console_log/
• [x] examples/dom/
• [x] examples/duck-typed-interfaces/
• [x] examples/fetch/
• [x] examples/guide-supported-types-examples/
• [x] examples/hello_world/
• [x] examples/import_js/
• [x] examples/julia_set/
• [x] examples/no_modules/
• [x] examples/paint/
• [x] examples/performance/
• [x] examples/raytrace-parallel/
• [x] examples/README.md
• [x] examples/todomvc/
• [x] examples/wasm2js/
• [x] examples/wasm-in-wasm/
• [x] examples/webaudio/
• [x] examples/webgl/

[andrehjr]

Can I work on add, canvas, char, and hello_world?

Already tried running cargo fix --edition on a few examples, and they mostly work without any warnings or issues. So, they only change necessary for those cases is to add edition = "2018" on Cargo.toml?

[alexcrichton]

@andrehjr sure thing, and thanks! Not all examples may need items fixed, so often edition = "2018" is good enough. Afterwards though you can also try cargo fix --edition-idioms and also try removing extern crate annotations and such.

[elpiel]

I will pickup the console_log as a start.
PS: I've added closure and duck-typed-interfaces as well. Will try to do more today.

[andrehjr]

Picking up webgl, webaudio, wasm-in-wasm and todomvc

[T5uku5hi]

I'll pickup dom, fetch, guide-supported-types-examples, import_js.

[elpiel]

I will try to implement julia_set, no_modules, paint and performance

[andrehjr]

Will try raytrace-parallel now!

Edit: also wasm2js

[alexcrichton]

Thanks all for all the assistance!

[fitzgen]

Thanks everyone! ^_^

[elpiel]

The least I can do and still be useful :blush: Thanks also for your quick responses!

[T5uku5hi]

I'm really happy to contribute wasm-bindgen!
Thank you so much 😊