Zig.md

WebAssembly with Zig

Environment setup

To compile this demo, you must install the following:

Zig

Go to ziglang.org and follow the instructions.

Wasmtime

You will find wasmtime at wasmtime.dev

Zig Code

we would create a simple Zig program that calculates caculates the fibonacci sequence of an integer input.

create a folder with a name of your choice, i would be using "Zig-to-WASI" as the name of my folder.

create a file main.zig, add following code into your main.zig file and save the file.

const std = @import("std");

fn fibonacci(index: u32) u32 {
    if (index < 2) return index;
    return fibonacci(index - 1) + fibonacci(index - 2);
}

pub fn main() !void {
    const stdout = std.io.getStdOut().writer();
    var x: u32 = 7;
    
    try stdout.print("fibonacci of {d} ", .{x});
    try stdout.print("is: {d} \n ", .{fibonacci(x)}  );
}

Compiling Zig code

1. Compile using zig

zig run main.zig

2. compile to WASM using the following command:

zig build-exe main.zig -target wasm32-wasi

3. The wasm file created in same folder

file main.wasm

4. wasm runtime

wasmtime main.wasm