Learn the fundamentals of JavaScript to make the React journey smooth.

Android Development with Ionic and React

Most of React comes down to JavaScript ES6 and its features and syntax. The fundamentals also include ternary operators, shorthand versions in the language, objects such as “this”, and JavaScript’s built-in functions (map, reduce, filter). It also includes general concepts such as composability, reusability, immutability, or higher-order functions. While we don’t necessarily need to master all these before starting with React, they will come up while practicing it, and learning these concepts will benefit us. 
This module will give us comprehensive JavaScript skills that will make our React journey smooth and straightforward.

JavaScript Fundamentals Before Learning React

A ternary operator --- also called Conditional Operator --- is the only JavaScript operator which takes three operands and returns a value based on some condition. It's an alternative for `if` statement. This could be used for multiple purposes and comes in very handy in React too!



Displaying JavaScript strings, objects, and arrays in React is not enough. What about an if-else statement for enabling *conditional rendering*? You cannot use an if-else statement directly in JSX, but you can return early from the rendering function. Returning `null` is valid in React when displaying nothing. Just like we did in the example given below.

>**Did you know?** Conditional rendering in React uses JavaScript operators like `if` or the conditional operator to create elements representing the current state, and let React show or hide a certain UI element based on a condition.

This lesson teaches the use of Ternary Operator in React for conditional rendering of JSX and explains it with the help of examples.

Getting Started

Variables, Operators & Expressions

Functions

Classes

Modules

React

Appendix

Conclusion

Ternary Operator in React