1. What is a Closure in JavaScript?
A closure is a function that retains access to its lexical scope, even after the outer function has finished execution. This allows inner functions to remember the environment in which they were created.
2. How Closures Work
Closures are created every time a function is created, allowing inner functions to access variables from the outer function even after it has returned.
3. Common Use Cases for Closures
- Data Encapsulation: Closures are often used to create private variables that are inaccessible from outside the function.
- Function Factories: Closures can be used to create functions dynamically based on input.
- Event Handlers: Closures are frequently used in event-driven programming, especially in callbacks and event listeners.
4. Conclusion
Closures are one of the most powerful features of JavaScript, enabling developers to write more flexible, maintainable, and modular code.