DesignPatterns

Course

1 - Singleton

• Useful when you want to create only one unstance of object from a class

2 - Factory

• Faunction that generate and returns an object from the specified class

3 - State

• An imlementation to a state machine

4 - Chain Of Responsibility

• A set of objects that can pass a process throght a flow
• Each object is handling only one step
• The order of the steps is

5 - Composite

• An implementation to containers and objects inside them
• An implementation to trees, subtrees and leaves

6 - Prototype

• Maked a deep Clone to an object

7 - Visitor

• To combine an existing functionallity to many classes
• To Add a new functionallity to many classes
• Disadvantage: You will always have to update the IVisitor after you add new class
• All the logic is implemented in the Visitor Class

8 - Adapter

• Useful for an old code
• Can be useful for a third party code

9 - Memento

• Remineds Undo and Redo
• You can save a state and return to it when you decide

10 - TemplateMethod

• Useful for code reuse
• Useful for running same code with minor changes each time
• Useful when set of functions run every time

11 - Strategy

• When you want to use Has-A instead of Is-A

12 - Decorator

• When you want to modify an object many times, every time modify the most updated object

13 - Builder

• When you want to manage a set of objects and create an object from that set