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mutable ↔ (typeof) Variable that can be changed

In JavaScript, only Object& Array are mutable whereas Primitive Value are immutable

References​

  1. let ↔ JS Keyword to Declare mutable Variable with Block Scope

  2. var ↔ JS Keyword to Declare mutable Variable with Function Scope

  3. ref ↔ Object return by useRef() to store state value, with mutable .current Stable Variable won't trigger re-render