Description:
Strategy pattern is a particular software design pattern, whereby algorithms can be selected at runtime. Formally speaking, the strategy pattern defines a family of algorithms, encapsulates each one, and makes them interchangeable. Strategy lets the algorithm vary independently from clients that use it.
Benefits:
- An alternative to subclassing
- Defines each behavior in its own class, which eliminates conditional statements
- Easier to extend a model to incorporate new behaviors without recoding the application
When to use:
- Many related classes differ only in their behavior.
- You need different variants of an algorithm.
- An algorithm uses data unknown to clients.
Diagram:
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Code sample:
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