Rust in the Browser

wasm-pack, wasm-bindgen, and getting a function to run on a web page.

cargo install wasm-pack
cargo new --lib life && cd life
cargo add wasm-bindgen

[lib]
crate-type = ["cdylib", "rlib"]

use wasm_bindgen::prelude::*;

#[wasm_bindgen]
pub fn greet(name: &str) -> String {
    format!("Hello, {name}!")
}

wasm-pack build --target web

#[wasm_bindgen] generates the glue that converts between JS strings and Rust &str — which means copying across the boundary. Remember that; part 3 is about avoiding it.