I discuss this in my book "Street Coder" for beginner and mid-level programmers, in a section titled "Do Repeat Yourself". Being hardcore about not repeating yo

I discuss this in my book "Street Coder" for beginner and mid-level programmers, in a section titled "Do Repeat Yourself". Being hardcore about not repeating yourself might create unnecessary dependencies and complicate your code structure. You can even cause irrelevant concerns to depend on each other causing it to become harder to maintain.