Double Pointers in Objective-C

Ah, pointers. Nothing strikes more fear into the heart of novice C programmers, or developers who aren’t used to them. Add to that the notion of double pointers (**) and address-of operators (&) and you are pretty much guaranteed to scare them away. But they are really not that hard, as long as you understand 3 things:

What is a Business Logic Layer Anyway?

Most developers are familiar with the concept of N-Tier Architecture. It is a software pattern that separates components of an application into separate logical layers to establish code boundaries, promote flexibility, and allow reuse. Most commonly this is accomplished using 3 layers:

Why Static Code is Bad

Most object-oriented developers are familiar with static methods and classes. They are present in most programming languages including C# and Objective-C (where they are known as class methods). Here are some common cases in which they are used: