exercises-in-programming-style/12-letterbox/README.md

Style #12

Constraints:

• The larger problem is decomposed into 'things' that make sense for the problem domain

• Each 'thing' is a capsule of data that exposes one single procedure, namely the ability to receive and dispatch messages that are sent to it

• Message dispatch can result in sending the message to another capsule

Possible names:

• Letterbox
• Messaging style
• Objects
• Actors

Style #12.2

Constraints:

• For each 'thing' class, let's bring the info methods from the Things style (#11)

• In the Things style, we used inheritance via a Python call to super to call a shared function from a base class

• We should apply this concept of code-reuse, but make sure to do so without using inheritance

• In typed languages, using delegates (or Callable in Python) is a recommended solution

• Just like in style 11, we will not be calling info in the main routine

Note:

A delegate is a type that safely encapsulates a method, similar to a function pointer in C and C++. Unlike C function pointers, delegates are object-oriented, type safe, and secure

Possible names:

• Delegation