Duncan Pierce duncanpierce.org

#aSelector do {
    aSelector: Output write "I did it";
}

This works with arguments too:

#addStuff with 10 20 do {
    addStuff Arg1 Arg2: Output write (Arg1 + Arg2 string);
}

#addStuff with 10 20 actually forms a new invocation object that can be applied to another object using do.

By the way, this is similar to the new preferred way of making a choice based on a boolean (if-then-else):

MyBoolean do {
    true: Output write "doing one thing";^
    false: Output write "doing another";
}