Refactoring to Cleaner Code

Why code refactoring?

Our systems are bloated! We can pick almost any system at random and spot obvious bits of rampant duplication. They could be a hundred-line-long method that’s an almost complete replication from another class or just a few lines of utility code repeated over and over.

The cost of such duplication is significant. Every piece of code duplicated increases the cost to maintain it as well as the risk of making a change. We want to minimize the amount of duplication in our system’s code.