Function Oriented Programming in Haskell

The purpose of this article is to understand Haskell and more importantly, Function Oriented language.

Introduction to Functions and Function Oriented Languages

What is a Function?

A Function

• is a set of executable commands
• accepts zero or more arguments
• returns one and only one result
• doesn’t create any side-effects

What are Higher-Order Functions?

Higher-order functions are functions that can have functions as arguments and also can return functions as results. Functions are treated as First class citizens in a programming language supports higher order functions.

An nth order function means that function can have n-1 functions as it’s arguments

For example, a function that can not have any functions as argument is called 1st order function. Similarly, a function that can have only one functions as argument is called 2nd order function.

What is Function Oriented Programming Paradigm?

Function Oriented Programming paradigm is basically a style of programming using Higher Order Functions and set of concepts that a function oriented language should follow.