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What is a Closure?

Answer​

A closure is a function that remembers variables from its outer scope even after the outer function has finished executing.

Example​

function createCounter() {
	let count = 0;
	return function () {
		count++;
		return count;
	};
}

const counter = createCounter();
console.log(counter()); // 1
console.log(counter()); // 2

How it Works​

Use Cases​

  • Data privacy
  • Function factories
  • Event handlers with state