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After teaching React extensively (33.000+ students), be it online for a larger audience or on-site for companies transitioning to web development and React, I always come to the conclusion that React is all about JavaScript. Most of it boils down to JavaScript ES6 and beyond features and syntax, but also ternary operators, shorthand versions in the language, the 'this' object, JavaScript built-in functions (map, reduce, filter) or more general concepts such as composability, reusability, immutability or higher-order functions. While you don’t need necessarily to master all of these before starting with React, they will come up while practicing it and so to learn them will put you at a great advantage. 

This course is my attempt to give you comprehensive JavaScript skills that will make your React journey smooth and straight-forward.

JavaScript Fundamentals Before Learning React

## Background
Classes are relatively new to JavaScript as previously, there was only JavaScript’s [prototype chain](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Inheritance_and_the_prototype_chain#Different_ways_to_create_objects_and_the_resulting_prototype_chain) which could be used for inheritance too. JavaScript classes build up on top of the prototypical inheritance giving the whole thing a more straightforward representation. Classes in JavaScript are syntactical sugar over prototype chains. You don't need to understand what a prototype chain or prototypical inheritance is for this course but knowing these concepts would give you some​ context of classes in the language.

## What is a class?

A class is a kind of separate mini-program with a context of its own --- methods (functions) and properties (variables). They describe an entity in a way that a computer can understand.​ Disparate 'instances' (called objects) of a class can be created and treated as variables. Let's examine the following code to learn how classes work in JavaScript.

# Background
Classes are relatively new to JavaScript as previously, there was only JavaScript’s [prototype chain](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Inheritance_and_the_prototype_chain#Different_ways_to_create_objects_and_the_resulting_prototype_chain) which could be used for inheritance too. JavaScript classes build up on top of the prototypical inheritance giving the whole thing a more straightforward representation. Classes in JavaScript are syntactical sugar over prototype chains. You don't need to understand what a prototype chain or prototypical inheritance is for this course but knowing these concepts would give you some​ context of classes in the language.

# What is a class?

A class is a kind of separate mini-program with a context of its own --- methods (functions) and properties (variables). They describe an entity in a way that a computer can understand.​ Disparate 'instances' (called objects) of a class can be created and treated as variables. Let's examine the following code to learn how classes work in JavaScript.

In this lesson, we briefly look at object-oriented programming concepts in JavaScript like classes and objects.

Getting Started

Variables, Operators & Expressions

Functions

Classes

Modules

React

Appendix

Conclusion

JavaScript Classes and Object Creation

Background

What is a class?