Book

Structs

% declares a shape. @ adds members. Methods use . for the receiver.

Primary and extra

% is the primary shape (one per name). @ adds members, often in another file. Members use the same $ / ~ / # leaders as top level.

Receiver

Call u.greet() and inside the method bare . is the receiver. Free functions do not get a receiver.

% user {
    $ name
    ~ visits = 0

    $ greet = () {
        ^ "Hello, {.name}"
    }

    $ visit = () {
        ~ .visits = .visits + 1
        ^ .
    }
}

$ u = user {
    name: "Ada",
    visits: 0
}
u.greet()
u.visit()

Sharing and chaining

Struct values are references, so passing a struct or binding it to another name shares one domain object. A plain method that falls off its body returns that receiver. Mutation methods can therefore read naturally as chains without a special builder type.