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Home/News/Unpacking Cloud Complexity: Understanding Execution Context and Hoisting in Depth

Unpacking Cloud Complexity: Understanding Execution Context and Hoisting in Depth

Hoisting và TDZ: vì sao biến ra undefined thay vì báo lỗi Trước khi chạy bất kỳ dòng code nào trong một execution context, engine có một pha quét toàn bộ scope để đăng ký các khai báo. var và function declaration được đăng ký và khởi tạo ngay trong pha này; let, const, class cũng được đăng ký nhưng

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