Immutability vs. ReadOnly

 Immutability vs. ReadOnly

  The key difference is that readonly restricts reassignment of a reference/variable, while immutable guarantees that the contents or state of an object cannot be changed after creation.

  Example (C#): A readonly List<T> cannot be set to a new List<T> instance, but you can still call methods like Add() or Remove() on the existing list.


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