Being an IT student, I was recently given some overview about design patterns by one of our teachers. I understood what they are for, but some aspects still keep bugging me.
Are they really used by the majority of programmers?
Speaking of experience, I've had some troubles while programming, things I could not solve for a while, but Google and some hours of research solved my problem. If somewhere in the web I find a way to solve my problem, is this a design pattern? Am I using it?
And also, do you (programmers) find yourself looking for patterns (where am I supposed to look, by the way?) when you start the development? If so, this is certainly a habit that I must start to embrace.
UPDATE: I think when I ask if programmers do use them, I'm asking if when you have a problem to solve you think "Oh, I should use that pattern".
Best Answer
When I was a novice programmer, I loved design patterns. I didn't just use design patterns. I inflicted them. Wherever and whenever I could. I was merciless. Aha! Observer pattern! Take that! Use a listener! Proxy! AbstractFactory! Why use one layer of abstraction when five will do? I've spoken to many experienced programmers and found that just about everyone who reads the GoF Book goes through this stage.
Novice programmers don't use design patterns. They abuse design patterns.
More recently, I find that keeping principles like the Single Responsibility Principle in mind, and writing tests first, help the patterns to emerge in a more pragmatic way. When I recognise the patterns, I can continue to progress them more easily. I recognise them, but I no longer try to force them on code. If a Visitor pattern emerges it's probably because I've refactored out duplication, not because I thought ahead of time about the similarities of rendering a tree versus adding up its values.
Experienced programmers don't use design patterns. Design patterns use them.