L03 Design Patterns

DesignPatterns

Design patterns are known and tested solutions to common problem. In software engineering we constantly come across similar problems. The same problems or tasks need to be programmed again and again, hence patterns. Design patterns catalog and document these solutions.They are built on industry knowledge of what works and why. We will look at what design patterns are, their history and the structure of documenting patterns.

As an example we look at the Observer pattern.

We will also look at Liskov Substitution Principle and the Open Close Principle, both which are very useful in building enterprise systems. Finally we look at creating objects.

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