JavaScript

Guides:

• Airbnb JavaScript Style Guide

Books:

• Books

JS Notes:

• An asynchronous function is a function that operates asynchronously via the event loop, using an implicit Promise to return its result.
• In JavaScript, closures are created every time a function is created, at function creation time (every time you create a function, you are taking a picture of it)
• Every time a function is created, we throw away the old picture and take a new one.
• Closure is a natural result of lexical scope when the language has functions as first-class values.
• When a function makes reference to variables from an outer scope, and that function is passed around as a value and executed in other scopes, it maintains access to its original scope variables - this is closure.
• Across all of programming, but especially in JS, closure drives many of the most important programming patterns, including modules.
• JS is one of very few languages where you have the option to create objects directly and explicitly, without first defining their structure in a class.