Functional programming

Question 1

What is a higher order function?

Answer 1

A function that takes a function as an argument or returns a function as a result, or does both

Question 2

What does the map function do?

Answer 2

Applies a function to every item on the list and returns as a list

Question 3

What does the filter function do?

Answer 3

Applies a condition to every item on the list and returns a list of items that meet the condition

Question 4

What does the fold/reduce function do?

Answer 4

Applies a ‘combining function’ to a list continually until the list is reduced to a single value