Walrus/Language

Method Calls

Function calls, closure calls, instance methods, and field access in Walrus.

Updated April 13, 20262 min readWalrus / Calls

Walrus supports ordinary function calls, closure calls, and class methods.

Function calls

Walrus

fn abs(x: int) -> int:
    if x < 0:
        return 0 - x
    return x

fn main() -> int:
    return abs(-3)

Calling closures

Walrus

fn makeAdder(k: int) -> fn(int) -> int:
    fn add(x: int) -> int:
        return x + k
    return add

fn main() -> int:
    let add7 = makeAdder(7)
    return add7(5)

Calling methods

Instance methods use the same call syntax:

Walrus

class Actor:
    var hp: int = 100

    fn alive() -> bool:
        return hp > 0

fn main() -> int:
    let actor = Actor { }
    if actor.alive():
        return actor.hp
    return 0

Property access

This expression:

Walrus

state.x

is a field lookup on an object or instance value. It is not the same operation as a function call even if both use dot syntax nearby.

Memory Ownership

Standard Library