[DART] Dart 3.0 신규 문법
1. Records Records are an anonymous, immutable, aggregate type. Like other collection types, they let you bundle multiple objects into a single object. Unlike other collection types, records are fixed-sized, heterogeneous, and typed.Records are real values; you can store them in variables, nest them, pass them to and from functions, and store them in data structures such as lists, maps, and sets..
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