They’re both shortcuts to creating class-like things. Take @dataclass in python for example, that’s similar to Struct for Ruby. ‘Data’ documentation from the

They’re both shortcuts to creating class-like things. Take @dataclass in python for example, that’s similar to Struct for Ruby. ‘Data’ documentation from the GitHub PR (https://zverok.space/ruby-rdoc/Data.html https://zverok.space/ruby-rdoc/Data.html): Data provides no member writers, or enumerators: it is meant to be a storage for immutable atomic values. But note that if some of data members is of a mutable class, Data does no additional immutability enforcement See also Struct, which is a similar concept, but has more container-alike API, allowing to change contents of the object and enumerate it.