closures in JavaScript?

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

Example:

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

let counter = outer();
console.log(counter()); // 1
console.log(counter()); // 2

Here, inner() remembers count from outer().