Fundamentals of Functional Programming

Question 1

What is meant by the term ‘Domain’?

Answer 1

Set from which the functions input values are chosen

Question 2

What is meant by the term ‘Co-Domain’?

Answer 2

Set from which the functions output values are chosen

Question 3

What is a Higher-order Function?

Answer 3

A function which takes another function as an argument and/or returns a function

Question 4

What does the ‘map’ higher-order function do?

Answer 4

Applies a given function to each element of a list, returning a list of results

Question 5

What does the ‘filter’ higher-order function do?

Answer 5

Processes a data structure, typically a list, in some order to produce a new data structure containing the elements from the original data structure that match the given condition

Question 6

What does the ‘reduce’ or ‘fold’ higher-order function do?

Answer 6

Reduces a list of values to a single value by repeatedly applying a combining function to a list of values

Question 7

What is partial function application?

Answer 7

The process of fixing arguments of a function, producing another function with less arguments. For example:

function add(a,b) = a + b

becomes…

function addTwo(a) = a + 2

Question 8

What is a first-class object?

Answer 8

First-class objects in functional programming are entities that can be passed as arguments to functions, returned from functions, and assigned to variables.