JavaScript Closures: A Practical Deep Dive

Closures are a fundamental part of JavaScript. If you've ever used a function within another function, you've used a closure. ### Data Encapsulation Closures allow us to create private variables that can only be accessed by specific functions. This is the basis for many design patterns in JavaScript. ### Memory Considerations While powerful, closures can lead to memory leaks if not used correctly. Understanding how the garbage collector handles closures is essential for writing efficient code.