Before we delve into the SOLID arena, it's useful to explore a less well-known principle, known as LoD, or the principle of least knowledge. This so-called law has three core ideas:
- A unit should have only limited knowledge about other units
- A unit should only talk to its immediate friends
- A unit should not talk to strangers
You may rightfully wonder what it means for a unit to talk to a stranger. A unit, in this context, is a specific coded abstraction: possibly a function, a module, or a class. And talking here means interfacing with, such as calling the code of another module or having that other module call your code.
This is a very useful and simple law to learn and then apply to all our programming, whether we're ...
