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

### Component syntax evolution
React’s way of defining components has evolved. In its early stages, the React.createClass() method was the default way of creating a React class component. Nowadays, it isn’t used anymore, because, with the rise of JavaScript ES6, the previously used React class component syntax became the default.

However, JavaScript is continually evolving, and thus JavaScript enthusiasts pick up new ways of doing things all the time. That’s why you will often find different syntaxes for React class components. One way of defining a React class component, with state and class methods, is the following:

# Component syntax evolution
React’s way of defining components has evolved. In its early stages, the React.createClass() method was the default way of creating a React class component. Nowadays, it isn’t used anymore, because, with the rise of JavaScript ES6, the previously used React class component syntax became the default.

However, JavaScript is continually evolving, and thus JavaScript enthusiasts pick up new ways of doing things all the time. That’s why you will often find different syntaxes for React class components. One way of defining a React class component, with state and class methods, is the following:

In this lesson, we'll study some ways that can make our React component declaration shorter and simpler.

Getting Started

Variables, Operators & Expressions

Functions

Classes

Modules

React

Appendix

Conclusion

React Component Syntax

Component syntax evolution