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Sự khác biệt giữa Map và WeakMap trong JavaScript là gì? · ORA·tech

Trung bình Pro#javascript

Sự khác biệt giữa Map và WeakMap trong JavaScript là gì?

15 tháng 2, 2026

Tóm tắt nhanh

Map giữ tham chiếu mạnh (strong reference) và chấp nhận mọi loại key, trong khi WeakMap chỉ nhận key là object/symbol và giữ tham chiếu yếu (weak reference), giúp tự động giải phóng bộ nhớ (Garbage Collection) khi key không còn được sử dụng.

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