Learning to Program

Design Patterns

As you design and build software, remember that your software problems are not entirely unique, even if your product is. In fact, your problems are probably very similar to problems that have well-defined solutions. These well-defined solutions are referred to as design patterns. Your challenge is to choose the right design pattern and then implement it correctly to solve your problem. As you approach a difficult programming problem, don’t reinvent the wheel; use a design pattern. Design patterns are meant to make your life a little easier.

The following list of design patterns is but a small sample. The purpose of this list is to give you an idea of what design patterns are good for and what types of problems they solve. Some ...