const expect = @import("std").testing.expect;

fn addFive(x: u32) u32 {
    return x + 5;
}

test "function" {
    const y = addFive(0);
    try expect(@TypeOf(y) == u32);
    try expect(y == 5);
}

fn fibonacci(n: u16) u16 {
    if (n == 0 or n == 1) return n;
    return fibonacci(n - 1) + fibonacci(n - 2);
}

test "function recursion" {
    const x = fibonacci(10);
    try expect(x == 55);
}

// When recursion happens, the compiler is no longer able to work out the maximum stack size,
// which may result in unsafe behaviour - a stack overflow.
// Details on how to achieve safe recursion will be covered in the future.
//
// Values can be ignored using _ instead of a variable or const declaration.
// This does not work at the global scope (i.e. it only works inside functions and blocks)
// and is useful for ignoring the values returned from functions if you do not need them.
// _ = 10; // ignore the value 10