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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

### Why not inheritance?
Imagine you are making a video game and need two characters: one that can shoot lasers and another that can cast spells. Both characters have a name and health.

You solve this problem neatly with inheritance. As per the following, a class structure with one parent class, the `character`, and two child classes called `caster` and `shooter` can be created.

# Why not inheritance?
Imagine you are making a video game and need two characters: one that can shoot lasers and another that can cast spells. Both characters have a name and health.

You solve this problem neatly with inheritance. As per the following, a class structure with one parent class, the `character`, and two child classes called `caster` and `shooter` can be created.

In this lesson, we study why React programmers prefer to use class composition over class inheritance.

Getting Started

Variables, Operators & Expressions

Functions

Classes

Modules

React

Appendix

Conclusion

React favours composition over inheritance

Why not inheritance?