Frontend DeveloperJavaScript Closuresbeginner
What is a closure in JavaScript?
This question tests whether a candidate understands lexical scope and how functions remember variables.
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KASA answer
A closure in JavaScript means an inner function has access to variables defined in its outer function, even after the outer function has returned. This happens because functions carry their lexical environment with them.
For example, a function that returns another function can keep a private counter variable. Every time the returned function runs, it can still access and update that counter. Closures are used in callbacks, event handlers, function factories, private state, and many React patterns.
Cover these points
- A function remembers its lexical scope.
- The outer function may finish, but variables can still be accessed.
- Closures help create private state.
- Common in callbacks, event handlers, and function factories.
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