The question is too vague. In what environment? Web? Desktop? Mobile? Embedded? Backend programming is a completely different world than mobile apps when it com

The question is too vague. In what environment? Web? Desktop? Mobile? Embedded? Backend programming is a completely different world than mobile apps when it comes to build size concerns, for instance. As an Android developer, I have to deal with the infamous 64K methods limit imposed by Dalvik. The "I import TONS of libraries" approach (to quote one commenter) is very bad practice here.