Gain insights into intermediate JavaScript, mastering interview questions, common design patterns, and deep understanding of the language. Learn with expert Arnav Aggarwal's engaging teaching method.

This is for those familiar with the basics of JavaScript and looking to advance their knowledge and really understand how the language works. We'll cover topics that are essential to help you read, understand, and write better code. Before starting, you should be familiar with the basics of variables, functions, and loops in JavaScript.

This course will enable you to master JavaScript interview questions that stump most developers. You'll be able to talk intelligently about the fundamentals of the language and about common design patterns.

This course has been created by Arnav Aggarwal, a full-stack engineer. Having attended a coding boot camp and having taught at another one, Arnav has extensive experience understanding how new developers learn to code. In under a month, Arnav's published articles on JavaScript concepts have received over 50,000 views and have been featured as staff selections on Medium.com and codementor.io because of their educational value.

Yangshun Tay

In response to "The Complete Rules to 'this'": 
Clear and to the point. This is one of the best explanations on “this” available on the net. I particularly liked how you explained about global function invocation being implicit method invocation on window. Thank you.

Front-End Engineer at Facebook

Jaya Arasalike

This is an excellent javascript course. Arnav covers deep basics well by giving enough examples and explaining what exactly is happening - how/ when values are changing. His diagrams, for example local vs global scope or the table representation for values vs reference makes reader easily understand what he is talking about and how it works. The quizzes at the end of each chapter, makes one think through what he or she has learnt and apply those concepts to arrive at the answers. That helps a lot in nailing down the core concepts. 

Bootcamp Graduate & Full-Stack Developer

Irshaad Bijan Adatia

In response to the Prototypes & Inheritance articles:

Having just finished a JavaScript course in college, this was a great stepping stone to move into an intermediate level if JS. Thank you.

It was also very well laid out.

Computer Science Student

Step Up Your JS: A Comprehensive Guide to Intermediate JavaScript

# Advanced Features

The following lessons include ES2015 constructs that aren't used very often in writing code. Learning these concepts will unlock more elegant ways of accomplishing certain tasks.

### New Data Structures

We'll cover sets and maps, two data structures that have been added to JavaScript. While objects have all the functionality of both, these constructs make certain tasks slightly more intuitive. They allow us to store data in ways that make it easier to retrieve and work with.

These data structures show their value when dealing with data that makes use of their strengths. Sets are excellent at filtering data. Maps are excellent when object keys need to be dynamic.

These data structures aren't used very commonly in professional software, but knowing them will improve your ability to think critically and attack a problem from different angles. They're especially impressive when used in coding interview problems.

### New Data Type

We'll cover Symbols as well. These are a brand new data type with a singular purpose and their behavior is quite odd.

### Customizable Iterators

Symbols are also needed to understand the implementation of iterators, which will allow us to define custom behavior in loops. We'll be able to override the default behavior of loops and extend their functionality.

### New Type of Function

Generators are last and allow us to create iterators easily. We can essentially return from a function multiple times and even pass values into the function. They're very powerful and provide a new interface to solve complex problems.

# ---  ---  ---

Again, none of these items are needed to write functional, powerful code. However, the concepts embedded in these constructs help us understand problem-solving in new ways. We can come up with new solutions to problems and solve them more elegantly with these tools at our disposal.

Many of these constructs will stretch our understanding of JavaScript and of software engineering itself. They'll open our minds and, if nothing else, they're fun and interesting to learn.

I'll see you in the next lesson.

# Advanced Features

The following lessons include ES2015 constructs that aren't used very often in writing code. Learning these concepts will unlock more elegant ways of accomplishing certain tasks.

## New Data Structures

We'll cover sets and maps, two data structures that have been added to JavaScript. While objects have all the functionality of both, these constructs make certain tasks slightly more intuitive. They allow us to store data in ways that make it easier to retrieve and work with.

These data structures show their value when dealing with data that makes use of their strengths. Sets are excellent at filtering data. Maps are excellent when object keys need to be dynamic.

These data structures aren't used very commonly in professional software, but knowing them will improve your ability to think critically and attack a problem from different angles. They're especially impressive when used in coding interview problems.

## New Data Type

We'll cover Symbols as well. These are a brand new data type with a singular purpose and their behavior is quite odd.

## Customizable Iterators

Symbols are also needed to understand the implementation of iterators, which will allow us to define custom behavior in loops. We'll be able to override the default behavior of loops and extend their functionality.

## New Type of Function

Generators are last and allow us to create iterators easily. We can essentially return from a function multiple times and even pass values into the function. They're very powerful and provide a new interface to solve complex problems.

# ---  ---  ---

Again, none of these items are needed to write functional, powerful code. However, the concepts embedded in these constructs help us understand problem-solving in new ways. We can come up with new solutions to problems and solve them more elegantly with these tools at our disposal.

Many of these constructs will stretch our understanding of JavaScript and of software engineering itself. They'll open our minds and, if nothing else, they're fun and interesting to learn.

I'll see you in the next lesson.

We'll cover more ES2015 features. These are more obscure, occasionally more difficult to understand, and have more limited use cases, but they make certain tasks easier and our code more elegant.

Behavior of Functions and Variables

Essential Modern JavaScript - ES2015+ In Depth

Object Oriented Programming: The Core

Object Oriented Programming: `this` and Inheritance

Introduction to Functional Programming

Functional Programming: Arrays and their Powerful Methods

Functional Programming: Objects and their Powerful Methods

A Dive into Asynchronous JavaScript

Advanced Modern JavaScript - Cutting Edge ES2015+

Conclusion

Section Overview

Advanced Features

New Data Structures