Gain insights into JavaScript fundamentals. Delve into variables, operators, functions, arrays, objects, and loops. Discover essential concepts to advance further in your coding journey with this beginner-friendly course.

This is an introduction to JavaScript for the complete beginner. It'll provide the fundamentals of the language. Topics include variables, operators, functions, arrays, objects, and loops. After this course, you should be ready to further your learning through advanced courses or other resources.

There is NO installation required for this course. Code can be viewed and run directly from the lessons.

This course has been created by Arnav Aggarwal, a full-stack engineer. Arnav has attended a coding boot camp and has taught at another one. He has extensive experience understanding how people learn to code. In under a month, Arnav's published articles on JavaScript concepts have received over 50,000 views and have been featured on Medium.com and code mentor.io due to their value.

After this course, check out the next one in the series.

Step Up Your JS: A Comprehensive Guide to Intermediate JavaScript

https://goo.gl/GjM8Mu

Introduction to JavaScript: First Steps

# Different Variable Types

We've shown these operators being used on numbers only. They can also be used with other variable types.

let string1 = 'Hello ';
let string2 = 'there!';
console.log(string1 + string2); // -> Hello there!

String addition just joins the strings together into a new, larger string.

## `NaN`

What happens if we try to use the other operators with strings? We get a new value: `NaN`.

let string1 = 'Hello ';
let string2 = 'there!';

console.log(string1 - string2); // -> NaN
console.log(string1 * string2); // -> NaN
console.log(string1 / string2); // -> NaN
console.log(string1 % string2); // -> NaN

`NaN` is technically a number type variable, but it stands for Not-a-Number. It's meant to show us that we messed up our math and attempted to perform some nonsensical operation.

Adding two strings to join them together makes sense. Dividing, multiplying, subtracting, or finding remainders does not. When we try, the JavaScript engine is nice enough to tell us that our mathematical operation failed. We get Not-a-Number.

# Type Coercion

We can try this with other variable types as well. We usually get `NaN`, but sometimes, something a little unexpected happens.

Learn what happens when we try to add, subtract, and divide strings. We'll cover how JavaScript handles 'abc' + 20. Learn what NaN is. We'll also discuss type coercion, a very import concept in JavaScript.

Introduction

Variables

Operators & if-statements

Functions

Arrays

Objects

Loops

Conclusion

Using Operators with Different Types

Different Variable Types

`NaN`