Docs

Control

If, loops, match, break, continue.

If chain

? score >= 90 {
    io.print('excellent')
}
: score >= 70 {
    io.print('passing')
}
: {
    io.print('try again')
}

Loops

* { }                  ; infinite
* ready == _ { }       ; while condition is true
* item : items { }     ; for-in list or range
<                      ; break nearest loop
>                      ; continue nearest loop

Match

/ std/io

$ number = 5
| number {
    1, 2, 3 {
        io.print('small')
    }
    4..9 {
        io.print('middle')
    }
    : {
        io.print('other')
    }
}

% user {
    $ name
}

$ person = user { name: 'Ada' }
| person {
    % user {
        io.print(person.name)
    }
    : {
        io.print('not a user')
    }
}

Value arms compare deeply and may list multiple expressions. Range arms test inclusive membership; % struct_name arms test a named struct tag. The default arm is optional. Result and option use their own arm shapes; see Result and option.