Functional Programming

Question 1

FP properties?

Answer 1

Without side effects
Immutable
Higher order functions
Lazy

Question 2

What is a side effect?

Answer 2

A function has one if it modifies state outside of its scope or has an observable interaction with its calling functions oir the outside world beyond its return value.

Question 3

What is referential transparency?

Answer 3

A function is RT if it can be replaced by a value and not change the behavior.

Question 4

What is a Monad?

Answer 4

It is a design pattern that wraps a value. It has an identity function and a flatMap function. They are used to deal with side effects.

Question 5

What are some common Monad types?

Answer 5

Option[A]
Try[A]
Future[A]

Question 6

What is the difference between Iteration and Observation?

Answer 6

Iteration: Client asks if there are elements left and pulls the next element.
Observation: Datasource pushes the next available element to client

Question 7

Aggregation functions?

Answer 7

Compared to element-wise operations, it groups multiple items together and apply a reduction.