JavaScript Closures: Hieu Sau Ve Cach Ham Ghi Nho Bien

Closure la mot trong nhung khai niem quan trong nhat trong JavaScript, la nen tang cho nhieu ky thuat lap trinh nang cao.

Closure la gi?

Closure la kha nang cua mot ham ghi nho cac bien tu pham vi ben ngoai, ngay ca khi ham duoc thuc thi o pham vi khac.

function outer() {
  let msg = 'Hello';
  return function inner() { console.log(msg); };
}

Ung dung

• Tao private variables
• Function factories
• Event handlers
• Module pattern

Ket luan

Hieu ve closure la chia khoa de tro thanh JavaScript developer gioi.