fn

The fn keyword declares a function: a named, reusable block of code with parameters and an optional return type.

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Syntax & Example

fn add(a: i32, b: i32): i32 {
    return a + b;
}

// No explicit return type: inferred
fn greet(name: string) {
    print(f"Hello, {name}!");
}

print(add(2, 3));
greet("Adesh");

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Use Cases

• Encapsulating reusable logic with a name and parameters.
• Declaring methods on structs/classes (with pub for visibility).
• Defining callbacks and higher-order functions.

See also: Functions.