What is a closure in JavaScript?

A closure is a function that keeps access to the variables of the place where it was created, even after that outer function has finished.

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

const counter = makeCounter();
console.log(counter());
console.log(counter());
console.log(counter());

Output:

The variable count is private: only the inner function can change it. Closures are used for private data, counters, callbacks and function factories.

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