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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

You can add new properties to an instance object any time later after its creation. True or False?

You can add new properties to an instance object any time later after its creation. True or False?

The most recommended way of declaring a variable is using: 

The most recommended way of declaring a variable is using:

Which of these are accessible throughout the code:

Which of these are accessible throughout the code:

What will be the output of the following code snippet?

```JavaScript
const student = {
  ID: '21',
  name: 'Jhon',
  GPA: '3.0',
};

const {GPA:n} = student;
console.log(n);
```

What will be the output of the following code snippet?
<pre><code class="language-JavaScript">const student = {
 ID: '21',
 name: 'Jhon',
 GPA: '3.0',
};

const {GPA:n} = student;
console.log(n);
</code></pre>

Automatic type conversion is supported by JavaScript. Is this statement True or False?

Automatic type conversion is supported by JavaScript. Is this statement True or False?

Test your knowledge of Variables, Expressions and Operators with this short quiz!

Getting Started

Variables, Operators & Expressions

Functions

Classes

Modules

React

Appendix

Conclusion

Quick Quiz on JavaScript Variables & Operators!