# Strategy Design Pattern

## When to use it?

* When you want to define a class that will have one behavior that is similar to other behavior in the list. 
* When you need to use one of the several behaviors dynamically

{% hint style="success" %}
Identify the aspects of your application that vary and separate them from what stays the same.
{% endhint %}

## Pros ( :thumbsup:) & Cons ( :thumbsdown:)

* :thumbsup: Often reduces the long list of conditionals

* :thumbsup: Reduce duplicate code

* :thumbsup: Keeps class changes from forcing other class changes

* :thumbsup: can hide complicated/secret code from the user

* :thumbsup:You can replace inheritance with composition.

* :thumbsdown: Increased number of objects and classes

* :thumbsdown:A lot of modern programming languages have functional-type support that lets you implement different versions of an algorithm inside a set of anonymous functions. Then you could use these functions exactly as you’d have used the strategy objects, but without bloating your code with extra classes and interfaces.

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> The [Strategy](https://refactoring.guru/design-patterns/strategy) pattern can be implemented with a simple anonymous (lambda) function in most modern programming languages.

## Code

{% embed url="<https://gist.github.com/SunilGudivada/7afe42412dfec5cc64cbc567ef3470c7>" %}
Strategy Design Pattern
{% endembed %}

## References

* <https://www.newthinktank.com/2012/08/strategy-design-pattern-tutorial/>&#x20;
* <https://refactoring.guru/design-patterns/strategy>
* <https://sourcemaking.com/design_patterns/strategy>


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