10 Design Patterns Explained in 10 Minutes

Creational

How objects are created

Singleton

• a type of object that can only be instantiated once

Prototype

• cloning and inheritance.

Builder

• Method chaining and instead of passing all arguments at instantiation it can be used to have setter methods that are called with method chaining so the object that gets returned after each method is progressively built up into its final form

Factory

• instead of using new keywords to instantiate an object you use a function to do it for you

Structural

How objects relate to each other

Facade

• a simplified API to hide other low level details in your code while still implementing them

Proxy

• using a stand in object in place of the original that can also contain side effects and additional behavior

Behavioral

How objects behave with each other

Iterator

Observer

• allows many objects to intercept events broadcasted by other objects.
• It's a one to many relationship (like a radio tower and several receivers)

Mediator

• middle man or broker
• like runways and airplanes (is the runway clear for the airplane to land)
  • Instead of having all the objects talking to each other via a many to many relationship
• mediator is like an air traffic controller coordinating between airplanes and runways

State

• where an object behaves a specific way based on a finite number of states