The Facade design pattern in AL programming.

The facade pattern is one of the most commonly used and known patterns, first described the book Design Patterns: Elements of Reusable Object-Oriented Software. It is classified as a structural pattern. While it originates from the object-oriented world, it for sure also applies to AL. The power of a facade is that it:
Improves the readability of your subsystem’s API, as it acts as an entry point to your subsystem. This also allows for easier documentation of your API, as you can focus it to a few public objects.

Improves the maintainability of your subsystem, as the internal subsystem can be modified or even completely replaced freely, without risking to break the public API - as long as the facade remains intact.

Ensures that your code remains loosely coupled and encapsulated, as no other subsystem can take dependencies on your internal implementation details. This also fosters the reusability of your code.

Suggests what needs most attention in your tests, as you would want to make sure that your subsystem’s public API behaves as designed.

https://alguidelines.dev/docs/patterns/facade-pattern/

In this video we briefly look at the facade design pattern.

Contents

0:00 (Introduction);
0:20 (Description of the facade design pattern);
4:10 (The Temp Blob in the system application in Business Central);
6:35 (Conclusion);

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