Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your
method is small, finding a good name is usually much easier.
For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the
commented part to a new method, and use the comment as a starting point when coming up with a good name for this
Commonly applied refactorings include:
If many parameters/temporary variables are present:
Complex classes like describe_cache() often do a lot of different things. To break such a class down, we need to identify a cohesive
component within that class. A common approach to find such a component is to look for fields/methods that
share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class
refactoring. If the component makes sense as a sub-class, Extract Subclass is
also a candidate, and is often faster.