In computer science, having value semantics (also value-type semantics or copy-by-value semantics) means for an object that only its value counts, not its identity.
[1][2] Immutable objects have value semantics trivially,[3] and in the presence of mutation, an object with value semantics can only be uniquely-referenced at any point in a program.
The concepts that are used to explain this concept are extensionality, definiteness, substitutivity of identity, unfoldability, and referential transparency.
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