Functional Programming

Question 1

What is functional programming?

Answer 1

Using functions as the primary building blocks and avoiding using mutable state.

Question 2

What are the pros of functional programming over imperative programming?

Answer 2

Powerful abstraction
expressive and concise code
easier to test
Code optimization

Question 3

What is imperative programming?

Answer 3

Code that describes HOW something should happen, involving explicit instructions at each step.

Question 4

What is declarative programming?

Answer 4

Focuses on WHAT should happen, abstracting the control flow.

Question 5

What is function chaining?

Answer 5

The output of one function serves as the input to another.

Question 6

What is a BiFunction?

Answer 6

A two argument method in FP.

Question 7

What is a consumer?

Answer 7

A void function in FPWhat

Question 8

is a predicate?

Answer 8

A Boolean function in FP

Question 9

what is a Supplier?

Answer 9

Object function in FP

Question 10

What is the structure of a BiFunction that takes two integers and returns a third?

Answer 10

BiFunction <int, int, int> functionName = (arg1, arg2) -> expression;

ex:
BiFunction<int, int, int> calcArea = (length, width) -> length*width;

Question 11

How do you use a BiFunction?

Answer 11

With the ‘apply’ keyword.
ex: area = calcArea.apply(3,5)

Question 12

How do you use a consumer?

Answer 12

With the ‘accept’ keyword.

Question 13

How do you use a predicate?

Answer 13

With the ‘test’ keyword.

Question 14

How do you use a supplier?

Answer 14

With the ‘get’ keyword.