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Design patterns are common architectural approaches, introduced to software by GOF design patterns book in 1994.
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Design patterns are solutions to recurring problems; guidelines on how to tackle certain problems
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Wikipedia describes them as
- In software engineering, a software design pattern is a general reusable solution to a commonly occurring problem within a given context in software design. It is not a finished design that can be transformed directly into source or machine code. It is a description or template for how to solve a problem that can be used in many different situations.
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creational design patterns
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structural design patterns
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behavioural design patterns