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diff --git a/zettelkast/Notes/290220240843 - Value Object.md b/zettelkast/Notes/290220240843 - Value Object.md new file mode 100644 index 0000000..10a9afa --- /dev/null +++ b/zettelkast/Notes/290220240843 - Value Object.md @@ -0,0 +1,15 @@ +A Value Object is a domain object that has no unique identity but if any of its properties change it is no longer the same. An example can be made with money. + +```py +from dataclasses import dataclass + +@dataclass(frozen=True) +class Money: + type: str + value: int + +Money("Euro", 10) != Money("Euro", 9) +Money("GBP", 10) != Money("Euro", 10) +``` + +Thus such an object is a perfect candidate for immutability. With python we can add @dataclass(frozen=True). Frozen=true makes it immutable.
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