Rust入門者向けハンズオン #5向け向け

index.js

const js = import("./rust_handson");

js.then(js => {
  js.to_hash("World!");
});

lib.rs

extern crate wasm_bindgen;
use wasm_bindgen::prelude::*;
use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};

#[wasm_bindgen]
extern "C" {
    fn alert(s: &str);
}

#[wasm_bindgen]
pub fn to_hash(s: &str) {
    let mut hasher = DefaultHasher::new();
    s.as_bytes().hash(&mut hasher);
    alert(&format!("{:x}", hasher.finish()));
}