Immutable: Unchangeable
Immutable objects
- Remain constant after they are created.
- Their internal state always remain valid
- They are thread safe and multiple readers can read them simultaneously.
- They are perfect for atomic, immutable value types e.g. a person's address
- We can define the members of such class using the "readonly" keyword
- To construct an immutable object we have to either provide a proper .ctor or a factory method
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