Functions

Functions are declared with fn. Parameter types are required. Parameters use name type syntax (no colon).

use system.io.{print}

// With explicit return
fn add(a int, b int) int
    return a + b

// With implicit return
fn sub(a int, b int) int
    a - b

// Inline body
fn greet(name string): print(f"Hello, {name}!")

fn main()
    let sum = add(10, 20)
    let diff = sub(10, 20)
    greet("World")
    print(f"Sum: {sum}")
    print(f"Diff: {diff}")

Functions without a return type implicitly return void. Functions support named arguments at the call site.