JavaScript Closures Guide
Closures are functions that remember their creation scope. They access outer function variables even after the outer function returns. The guide walks through How Closures Work. `function counter(){let c=0; return function(){c++; return c}}`. The inner function closes over c, keeping it alive. Uses: data encapsulation (private variables), function factories, event handlers with state, partial application, memoization. The guide is organized into 1 sections that build on each other, each pairing a prose explanation with runnable code. Related guides: Arrays, Strings, Numbers, Math, Date. This is one of 145 JavaScript guides on JS Reference — see the full list on the guides page. Practice what you learn in the JavaScript playground, and look up any unfamiliar term in the JavaScript glossary.