Gain insights into JavaScript ES6+, ternary operators, 'this' object, built-in functions, and core concepts like composability and immutability to ease your React learning journey.

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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

### Inheritance in JavaScript
Usually, classes are used for inheritance in object-oriented programming. Here is a brief refresher on inheritance; inheritance enables new classes to take on the properties and methods of existing classes. A class that another class inherits is called a *superclass* or *base class*. A class that inherits from a superclass is called a *subclass* or *derived class*. In JavaScript, the *`extends`* keyword can be used to inherit one class from another class as shown in the following example. So, the derived class, `ReactDeveloper`, inherits all the abilities from the base class, `Developer`, and also adds its specialized capabilities, namely the `getJob()` method to it.

# Inheritance in JavaScript
Usually, classes are used for inheritance in object-oriented programming. Here is a brief refresher on inheritance; inheritance enables new classes to take on the properties and methods of existing classes. A class that another class inherits is called a *superclass* or *base class*. A class that inherits from a superclass is called a *subclass* or *derived class*. In JavaScript, the *`extends`* keyword can be used to inherit one class from another class as shown in the following example. So, the derived class, `ReactDeveloper`, inherits all the abilities from the base class, `Developer`, and also adds its specialized capabilities, namely the `getJob()` method to it.

In this lesson, we discuss the syntax and concept of class inheritance in Javascript.

Getting Started

Variables, Operators & Expressions

Functions

Classes

Modules

React

Appendix

Conclusion

Class Inheritance

Inheritance in JavaScript