JavaScript the Hard Parts: Closure, Scope & Execution Context

During this online workshop recording, Nat will go under the hood of JavaScript, so you can confidently tackle new problems and work through blocks.
Nat will cover:
- Understand how closure works under the hood (one of the most misunderstood but most powerful features of JavaScript)
- Understand core JS runtime features - execution context, JavaScript execution model, and the variable environment
- Be able to wield, optimize and debug popular pro utility functions like once and memorize
- Be able to implement the module pattern - one of the cleanest and most resilient design patterns in JavaScript
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#learntocode #javascript #programminglanguage #recursion

[@truth8690]

🤍🤍

[@Odisej1]

One semi-stupid question. Why would some junior web developer need to know this stuff? What is practical implementation of this knowledge?

[@Codesmith]

Hey @Odisej1 - I’m so glad you asked! Closure is one of the most challenging concepts in JavaScript, but also one of the most important! One common implementation is memoization - say that you have a complicated function that takes a long time to run. The first time you pass in a given input, your function will need to take that time to figure out the answer. Now, if you invoke that function again, passing in the same input, your function would need to repeat all of that work! Wouldn’t it be amazing if your function had “memories”, where it could store the answer? That’s closure! Closure makes it possible for your function to persist data that’s only available to that particular function - so, when you invoke your memoized function with the same input, your function knows to return the same answer (without having to do all that work again!). Really cool stuff!! Diving into challenging concepts like this is a great way to level up your software engineering skills. (It’s also a very popular interview question!)

[@Odisej1]

@@Codesmith Thank you for the answer