The Complete JavaScript Closures Course

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The Complete JavaScript Closures Course 0.0 (0 ratings) Course Ratings are calculated from individual students’ ratings and a variety of other signals, like age of rating and reliability, to ensure that they reflect course quality fairly and accurately.

What you’ll learn

  • Get a mature understanding of main JavaScript principles
  • Learn how returning functions from functions works
  • Get an introduction on Scope and the Call Stack
  • Rebuild and diagram the Once function in JavaScript
  • Use Closure to create a Memoize function
  • Learn how to use Closure in professional engineering
  • Improve your technical communication
  • Have a set of professional techniques for writing more maintainable code


  • The course is designed to take you from first principles up to advanced implementations and so can work for engineers from beginner to expert level. Some experience with JavaScript functions is recommended.



In this course, we’ll dive deep into JavaScript Closures. We’ll cover what Closures are and then diagram through examples to highlight the true power of Closures.

Why learn Closure when I could be learning Node or React?

The purpose of this course is for you to take time out of ‘making it work to meet deadlines’ to truly understand a concept that will allow you to accelerate all your future engineering.

Closure is that building block that all the other concepts sit upon. 4 of the most important areas of modern programming rest on it:

  • Professional-grade functions like memoize and once to write cleaner and more efficient code
  • Design patterns like Node’s module pattern (the CommonJS pattern)
  • Functional programming techniques like partial application, currying and monads
  • Asynchronous JavaScript and the callback pattern

So how should I learn this?

In this course, we will visualize every line of code as it runs. There are no mysteries in programming if you don’t skip steps!

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