# Hello, World!
[View full source code][code] or [view the compiled example online][online]
[online]: https://rustwasm.github.io/wasm-bindgen/exbuild/hello_world/
[code]: https://github.com/rustwasm/wasm-bindgen/tree/master/examples/hello_world
This is the "Hello, world!" example of `#[wasm_bindgen]` showing how to set up
a project, export a function to JS, call it from JS, and then call the `alert`
function in Rust.
## `Cargo.toml`
The `Cargo.toml` enables depends on the `wasm-bindgen` crate. Here we're using
a `path` dependency because this example lives in the `wasm-bindgen` repository
itself, but you'd use the commented out version beneath it instead.
Also of note is the `crate-type = ["cdylib"]` which is largely used for wasm
final artifacts today.
```toml
{{#include ../../../examples/hello_world/Cargo.toml}}
```
## `src/lib.rs`
Here we define our Rust entry point along with calling the `alert` function.
```rust
{{#include ../../../examples/hello_world/src/lib.rs}}
```
## `index.js`
Our JS entry point is quite small!
```js
{{#include ../../../examples/hello_world/index.js}}
```
## Webpack-specific files
And finally here's the Webpack configuration and `package.json` for this
project:
**webpack.config.js**
```js
{{#include ../../../examples/hello_world/webpack.config.js}}
```
**package.json**
```json
{{#include ../../../examples/hello_world/package.json}}
```
