wasm-bindgen/guide/src/examples/closures.md

# web-sys: Closures

[View full source code][code] or [view the compiled example online][online]

[online]: https://rustwasm.github.io/wasm-bindgen/exbuild/closures/
[code]: https://github.com/rustwasm/wasm-bindgen/tree/master/examples/closures

One of the features of `#[wasm_bindgen]` is that you can pass closures defined
in Rust off to JS. This can be a bit tricky at times, though, so the example
here shows how to interact with some standard web APIs with closures.

## `src/lib.rs`

```rust
{{#include ../../../examples/closures/src/lib.rs}}
```
Reorganize and rewrite examples This commit is a large-ish scale reorganization of our examples. The main goal here is to have a dedicated section of the guide for example, and all examples will be listed there. Each example's `README` is now just boilerplate pointing at the guide along with a blurb about how to run it. Some examples like `math` and `smorgasboard` have been deleted as they didn't really serve much purpose, and others like `closures` have been rewritten with `web-sys` instead of hand-bound bindings. Overall it's hoped that this puts us in a good and consistent state for our examples, with all of them being described in the guide, excerpts are in the guide, and they're all relatively idiomatically using `web-sys`. 2018-09-20 16:20:42 -07:00			`# web-sys: Closures`

Build examples and deploy to gh-pages Rejigger Travis slightly to take advantage of build stages to build the `gh-pages` branch amongst a set of builders, and then when they're all done we synchronize and deploy the site. For now use S3 as a backing store for data between jobs. 2018-09-20 17:54:06 -07:00			`[View full source code][code] or [view the compiled example online][online]`
Reorganize and rewrite examples This commit is a large-ish scale reorganization of our examples. The main goal here is to have a dedicated section of the guide for example, and all examples will be listed there. Each example's `README` is now just boilerplate pointing at the guide along with a blurb about how to run it. Some examples like `math` and `smorgasboard` have been deleted as they didn't really serve much purpose, and others like `closures` have been rewritten with `web-sys` instead of hand-bound bindings. Overall it's hoped that this puts us in a good and consistent state for our examples, with all of them being described in the guide, excerpts are in the guide, and they're all relatively idiomatically using `web-sys`. 2018-09-20 16:20:42 -07:00
Build examples and deploy to gh-pages Rejigger Travis slightly to take advantage of build stages to build the `gh-pages` branch amongst a set of builders, and then when they're all done we synchronize and deploy the site. For now use S3 as a backing store for data between jobs. 2018-09-20 17:54:06 -07:00			`[online]: https://rustwasm.github.io/wasm-bindgen/exbuild/closures/`
Reorganize and rewrite examples This commit is a large-ish scale reorganization of our examples. The main goal here is to have a dedicated section of the guide for example, and all examples will be listed there. Each example's `README` is now just boilerplate pointing at the guide along with a blurb about how to run it. Some examples like `math` and `smorgasboard` have been deleted as they didn't really serve much purpose, and others like `closures` have been rewritten with `web-sys` instead of hand-bound bindings. Overall it's hoped that this puts us in a good and consistent state for our examples, with all of them being described in the guide, excerpts are in the guide, and they're all relatively idiomatically using `web-sys`. 2018-09-20 16:20:42 -07:00			`[code]: https://github.com/rustwasm/wasm-bindgen/tree/master/examples/closures`

			One of the features of `#[wasm_bindgen]` is that you can pass closures defined
			`in Rust off to JS. This can be a bit tricky at times, though, so the example`
			`here shows how to interact with some standard web APIs with closures.`

			## `src/lib.rs`

			```rust
			`{{#include ../../../examples/closures/src/lib.rs}}`
			```