Since union types are composed from existing types, they give an ability to define a supertype even af- ter a class hierarchy is fixed. Union types can be used not only by case analysis as in ML datatypes, but also by direct member access as ordinary types.
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May 5, 2012 · Unions can be used as a type just like a class and structure(with some restrictions).It can have member functions. It can be used as an OOP construct.
Union types can be useful for implementing heterogeneous collections and for grouping independently developed classes with similar interfaces, which has been ...
Union types can be useful for implementing heterogeneous collections and for grouping independently developed classes with similar interfaces, which has been ...
Mar 29, 2021 · Union types were added to the language to make it possible to explicitly achieve the semantics that had previously been, but ceased to be, supported implicitly.
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To rigorously show the safety of union types, this work formalizes them on top of Featherweight Java and proves that the type system is sound.
The authors propose union types for statically typed class-based object-oriented languages as a means to enhance the flexibility of subtyping, allowing the ...
Feb 20, 2020 · Parametric types with their parameters unspecified are abstract types. In particular, they are referred to as UnionAll Types.
Oct 25, 2023 · In TypeScript, a union type allows a variable to have one of several possible types. You can define a union type by using the | (OR) operator to specify ...
Jul 7, 2017 · Discriminated unions really shines in conjunction with pattern-matching, where you select different behavior depending on the cases.