JavaScript Closures

JavaScript closures happen when a function inside another function remembers the variables from its parent. Even after the parent function finishes running, the inner function still has access to those original variables. Developers use this to create private data.

1/* this creates a closure */
2function makeCounter() {
3  let count = 0;
4  return function() {
5    count++;
6    return count;
7  }
8}
9let counter = makeCounter();