Lecture 7-Builder pattern

Question 1

What is the intent behind the builder pattern?

Answer 1

To separate the construction of a complex object from its representation, so that the same construction process can create different representations.

Question 2

What are 2 situations where we would use the builder pattern ?

Answer 2

1.Algo of creating a complex object is independent of the parts that make uptime object and how they are assembled.
2. Construction process must allow different representations for the object that is constructed.

Question 3

How can we use the builder pattern? (2)

Answer 3

1. Use it to get rid of a telescopic constructor.–> overload the constructor and create several shorter versions with fewer parameters.
2. Use it to construct Composite trees or other complex objects.

Question 4

What are some pros of the builder pattern(3)

Answer 4

-You can construct objects step-by-step, defer construction steps, or runt them recursively.
-You can reuse the same construction code when building representations.
-SRP( Single Responsibility Principle) : Can isolate complex construction code from business logic.

Question 5

What is the con of the builder pattern?

Answer 5

The overall complexity of code increases since it requires creation of multiple new classes.