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Discriminated Unions trong TypeScript là gì và tại sao chúng hữu ích? · ORA·tech

Trung bình Pro#typescript

Discriminated Unions trong TypeScript là gì và tại sao chúng hữu ích?

15 tháng 2, 2026

Tóm tắt nhanh

Discriminated Unions là kỹ thuật kết hợp Union types với một thuộc tính literal chung (discriminant) để TypeScript tự động narrow type chính xác. Kỹ thuật này giúp đảm bảo type-safety tuyệt đối và hỗ trợ exhaustiveness checking (tránh bỏ sót case) khi xử lý các cấu trúc dữ liệu phức tạp.

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