C and C++ were intended to be the primary languages used for WebAssembly, but Rust is a perfectly suitable substitute. Rust is a systems programming language that is syntactically similar to C++. It was designed with memory safety in mind, but still retains the performance advantages of C and C++. The current nightly build of Rust's compiler can generate .wasm files from Rust source code, so if you prefer Rust and are familiar with C++, you should be able to use Rust for most of the examples in this book.

The following snippet demonstrates how to print Hello World! to the console using Rust:

fn main() {
    println!("Hello World!");
}