> Closures aren't magic—they're simply JavaScript's way of keeping data alive when a function still needs it. Every JavaScript developer has heard statements like: "A closure is a function that remembers variables from its outer scope." "The in...

Most developers memorize the definitions of Lexical Scope, Lexical Environment, Scope Chain, and Closure without understanding what actually happens inside the JavaScript engine. In this article, we'll build these concepts step by step and understan...