Refactoring to patterns. Creation code

On the other hand there are a sibling of refactoring and it’s design patterns. Design patterns are here to help us not to reinvent bicycle while constructing our software. There always exists common patterns to solve particular problem. They are tested by time, widely known among programmers etc.

So recently I bought a book called “Refactoring to Patterns” by Joshua Kerievsky. It includes both refactoring and design patterns stuff and teaches how (when, why) to refactor existing code to certain suitable patterns.

So I start writing series of articles on the book, the first one is about creation.

List of refactoring in this chapter is following:

When a class has so many constructors(intializers) with different parameters, it’s hard for client of it to decide which one to call. Here it’s better to replace constructor with declarative creation methods.

If you’re not familliar with what creation method is, then it’s just a static or non-static method that instantiates an object.

Below is an example. Before refactoring to the pattern:

After refactoring to the pattern:

Although this is a very useful refactoring, there exists some alternatives:

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