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An interactive exploration of closures, scopes, and lexical environments. Click on examples to see closures in action and understand how they work.
A closure is a function that retains access to variables from its outer scope, even after the outer function has completed execution.
The context in which a function is created, including all accessible variables. Closures "capture" this environment.
Using closures to create private variables that can only be accessed through specific methods, protecting internal state.
Module patterns, factory functions, callbacks, event handlers, memoization, and maintaining state in async operations.