Converting Rust into WebAssembly via wasm-bindgen

Let's start with a Hello World example with wasm-bindgen:

1. Create a new project with Cargo:

    $ cargo new --lib hello_world
   Created library `hello_world` package

This will create a new Rust project with all the necessary files.

2. Open the project in your favorite editor. Open the Cargo.toml file to add crate-type and add the wasm-bindgen dependency:

   [package]
   name = "hello_world"
   version = "0.1.0"
   authors = ["Sendil Kumar"]
   edition = "2018"
   [lib]
   crate-type = ["cdylib"]
   [dependencies]
   wasm-bindgen = "0.2.38"

3. We define the dependency under the [dependencies] table in the toml file. Open the src/lib.rs file and replace the contents with the following:

   use wasm_bindgen::prelude::*;
   #[wasm_bindgen]
   pub fn hello_world() -> String {
   "Hello World".to_string()
   }

We import the wasm_bindgen library using use wasm_bingen::prelude::* and then...