Extract Pure Functions

Blog post series

This blog post is part of a series about legacy coderetreat and legacy code techniques you can apply during your work. Please click to see more sessions about legacy code.

Purpose

We have some class that is very big. We want to divide the existing code into more methods and classes so that we have in the end some code that is easier to understand. If the methods are small, they are easy to change. In the same time the code would respect the Single Responsibility Principle. We optimize our software for changeability. In the following we will see how we can extract pure functions to achieve that.