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Copy file name to clipboardExpand all lines: BehavioralPatterns/Strategy/README.md
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* defines a family of algorithms,
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* encapsulates each one, and
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* make them interchangeable.
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Strategy lets the algorithm vary independently from clients that use it.
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## Problem
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**Usage**
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```cs
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Duckmallard=newMallardDuck();
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mallard.PerformQuack();
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mallard.PerformFly();
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- A class should be configured with an algorithm instead of implementing an algorithm directly.
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- An algorithm should be selected and exchanged at run-time.
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// change the flying behavior dynamically
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Duckmodel=newModelDuck();
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model.PerformFly(); // default behavior
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model.FlyBehavior=newFlyRocketPowered(); // set a different flying behavior at runtime
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model.PerformFly();
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```
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## Solution
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- Define an interface `Strategy` for performing an algorithm and define separate classes that implement the `Strategy` interface and encapsulate an algorithm in different ways.
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## Common Structure
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* Strategy (SortStrategy)
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* declares an interface common to all supported algorithms. Context uses this interface to call the algorithm defined by a ConcreteStrategy
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* maintains a reference to a Strategy object
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* may define an interface that lets Strategy access its data.
- A context may pass all data required by the algorithm to the strategy when an algorithm is called.
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- A context forwards requests from its clients to its strategy. Clients usually create and pass a ConcreteStrategy object to the context; thereafter clients interact with the context exclusively.
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## Benefits
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## Drawbacks
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## Example
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**Usage**
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```cs
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Duckmallard=newMallardDuck();
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mallard.PerformQuack();
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mallard.PerformFly();
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// change the flying behavior dynamically
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Duckmodel=newModelDuck();
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model.PerformFly(); // default behavior
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model.FlyBehavior=newFlyRocketPowered(); // set a different flying behavior at runtime
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