Immediately-Invoked Function Expressions(or IIFE, pronounced “iffy”) are super useful and commonplace in JavaScript development. If you are unfamiliar with IIFE’s now is the time you learnt all about them.
Factory and constructor functions are possibly the most used and powerful JavaScript patterns around, they are straight forward and easy to reason about whilst promoting modularity.
Learn how to use Declarations and Expressions to create and assign data to JavaScript Variables and Functions.
During compilation JavaScript variable and function declarations are moved around their containing scope. This behaviour is called Hoisting, you may not even notice that it is happening but it is an important concept to be aware of.
