Structural

Facade

Provides a simplified interface to a complex subsystem.

Library APIsService layersComplex operations

Understanding Facade

The Facade pattern provides a simplified interface to a complex subsystem. It doesn't encapsulate the subsystem but provides a convenient high-level interface while keeping the subsystem accessible for advanced usage.

How It Works

Client

Facade

PlaceOrder()

Subsystem

Inventory

Payment

Shipping

Complex Subsystem

Multiple interconnected components with complex interfaces.

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Basic Implementation

Computer startup facade hiding complex boot sequence:

main.go

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Real-World Example: E-commerce Order

Order processing facade coordinating inventory, payment, and shipping:

main.go

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