Questions tagged [design-patterns]

A design pattern is a general reusable solution to a commonly occurring problem in software design.

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11 answers
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Are design patterns generally a force for good or bad? [closed]

I've heard it argued that design patterns are the best thing since sliced bread. I've also heard it argued that design patterns tend to exacerbate "Second System Syndrome," that they are massively ...
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22 votes
6 answers
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Is loose coupling w/o use cases an anti-pattern?

Loose coupling is, to some developers, the holy grail of well-engineered software. It's certainly a good thing when it makes code more flexible in the face of changes that are likely to occur in the ...
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24 votes
16 answers
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What is the most frequently used design pattern? [closed]

Which design pattern do you think is the most popular?
71 votes
5 answers
15k views

When is Singleton appropriate? [closed]

There is a widely accepted opinion that Singleton is an anti-pattern. As usual, there are always exceptions to the rule. Can you explain why Singleton is a bad choice in general and give an example of ...
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68 votes
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What is inversion of control, and when should I use it?

I am designing a new system and I want to know what inversion of control (IOC) is, and more importantly, when to use it. Does it have to be implemented with interfaces or can be done with classes?
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