Facade Pattern

This lesson discusses how the interface to a complex system of interacting entities can be simplified by providing a front that hides the subsystem intricacies from the client.

What is it ?

A facade literally means the front of a building or an outward appearance to hide a less pleasant reality. The facade pattern essentially does the same job as the definition of the word facade. Its purpose is to hide the complexity of an interface or a subsystem.

If you take a look around the amenities of current life, almost everything is a facade. When you press a button to turn on the room lights. The button is a facade that hides from you the complexities of electric power generation and distribution and magically lights up your room. The facade makes complex systems easier to use.

Formally the facade pattern is defined as a single uber interface to one or more subsystems or interfaces intending to make use of the subsystems easier.

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