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Sự khác biệt về hoisting giữa Function Declaration và Function Expression là gì? · ORA·tech

Trung bình Pro#javascript

Sự khác biệt về hoisting giữa Function Declaration và Function Expression là gì?

15 tháng 2, 2026

Tóm tắt nhanh

Function Declaration được hoisted toàn bộ (cả tên và định nghĩa), cho phép gọi trước khi khai báo. Ngược lại, Function Expression chỉ được hoisted phần khai báo biến, việc gọi hàm trước khi gán sẽ gây lỗi `TypeError` hoặc `ReferenceError` tùy thuộc vào cách khai báo biến (`var`, `let` hay `const`).

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