Compiled to WebAssembly and calling into directly from JavaScript

main.rs

extern crate libc;
#[macro_use]
extern crate lazy_static;

use std::sync::Mutex;
use std::vec::Vec;


lazy_static! {
    static ref BUFFER: Mutex<Vec<i32>> = Mutex::new(Vec::with_capacity(8));
}

fn main() {
    println!("Rust-based WebAssembly loaded successfully.");
}

#[no_mangle]
pub fn push(val: i32) {
    BUFFER.lock().unwrap().push(val)
}

#[no_mangle]
pub fn pop() -> i32 {
    BUFFER.lock().unwrap().pop().unwrap()
}