Introduction to Functional Programming
Explore functional programming in JavaScript by understanding pure functions, immutability, and how to manage scope effectively. This lesson helps you write cleaner, more predictable code by separating data and behavior, making your code easier to debug and maintain.
We'll cover the following...
Introduction
Functional programming is a common paradigm in JavaScript. When we say it’s a paradigm, we mean it’s a way of thinking about and writing code that follows certain design principles.
Object-oriented programming aims to keep data and behavior together into a single item. Data and the methods used to work with that data should be together in one unit. Directly manipulating that data is acceptable.
Functional programming aims to separate data from behavior. It aims to keep data separate from the functions that work on it. In doing so, it results in functions that are pure and reusable.
Pure Functions
A function is said to be pure if it meets the following criteria:
- Does not affect anything outside its scope