Next: , Previous: , Up: Top   [Index]

5 Control Flow Messaging

Fools ignore complexity. Pragmatists suffer it. Some can avoid it. Geniuses remove it.

Alan Perlis

Cuis-Smalltalk syntax is minimal. Essentially there is syntax only for sending messages (i.e., expressions) . Expressions are built up from a very small number of primitive elements. There are only 6 keywords, and there is no syntax for control structures or for declaring new classes. Instead, nearly everything is achieved by sending messages to objects. For instance, instead of an if-then-else control structure, Smalltalk sends messages like #ifTrue: to Boolean objects. As we already know, new (sub)classes are created by sending a message to their superclass.