الإحتفاظ بحالة مستقلة بإستخدام Closure

function createCounter() {
  let count = 0;
  return () => ++count;
}
const counter = createCounter();
console.log(counter());
console.log(counter());

1
2

function createCounter() {
  let count = 0;
  return () => ++count;
}
const first = createCounter();
const second = createCounter();
first();
console.log(first());
console.log(second());

2
1