Creational Design Patterns

Question 1

What are the types of creational design patterns?

Answer 1

Abstract factory
Builder
Factory method
Prototype
Singleton

Question 2

Give an example of the abstract factory pattern

Answer 2

An abstract class that subclasses extend that provides a template for making a concrete factory

Question 3

Give an example of a singleton. And how are singletons made that way?

Answer 3

Private constructor. Or abstracted by framework. And an example is an angular service.

Question 4

What is the prototype pattern, and how is it used

Answer 4

When you want to make new objects by calling .clone on an existing object. Many JavaScript array methods work this way- array.map is a great example.