Hi, mate. I'm mostly a game programmer, so my opinion might be biased by my
field of work, but these are what I find most useful:
Observer: Everytime I need to notify interaction or changes in the systems.
Factory method: More generic factories or even defining the classes in
external files.
State: Useful for finite state machines. Usually in AI, but I tend to use it
everytime I have classes with changing behavior.
Facade and Adapter: Wrappers in general terms. Really good for encapsulating
complex systems in relatively simple classes.
Bridge: Reducing complexity of elements by dividing their responsibilities
in many different classes.
Mediator: Coordinate the different classes (game elements, GUI
components...).
Composite: Complex systems made of smaller ones recursively.
Command: I found this specially useful for messaging between objects (in
game terms: Interacting with other objects)
Singleton: With the help of the Facade pattern, great when you need to make
many unique subsystems able to interact between them (in game terms:
Graphics, Sound, Physics subsystems...)
Those are the ten I most use. I've put them as I remembered them, so that's
the most objective ranking I can provide. Hope that helps.
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