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In computer science, a type system is nominal (also called nominative or name-based) if compatibility and equivalence of data types is determined by explicit declarations and/or the name of the types. Nominal systems are used to determine if types are equivalent, as well as if a type is a subtype of another.
- Comparison of programming languages by type system - Wikipedia
This is a comparison of the features of the type systems and...
- Type system - Wikipedia
These different equational theories of types vary widely,...
- Comparison of programming languages by type system - Wikipedia
Checking against the name is nominal typing and checking against the structure is structural typing. Nominal typing. Languages like C++, Java, and Swift have primarily nominal type systems.
Jan 1, 2013 · Nominal: Type compatibility is based on type name. Structural: Type compatibility is based on the type structure, e.g. in C if 2 variables are struct types with different names but the same structure, then their types are compatible. Now about explicit and implicit: why is it different from static and dynamic typing?
- In a dynamically typed system, values have types at runtime but variables and functions do not. In a statically typed system, variables and functio...
- static vs dynamic describes when types are checked (more or less at compile time or at execution time). nominal vs structural describes when two t...
- Structural: Type compatibility is based on the type structure, e.g. in C if 2 variables are struct types with different names but the same structur...
- The best explanation I've seen of the distinction between (actually subsumption of) dynamic and static type systems is in this blog post by Bob Har...
Jan 29, 2018 · This article introduces types, type systems, and associated terminology—all from a practical point of view. Sections 2–4 describe how type systems can be placed on three axes: static vs. dynamic, manifest vs. implicit, and nominal vs. structural. Section 5 closes with a discussion of type safety.
In computer science, a type system is nominal, nominative, or name-based if compatibility and equivalence of data types is determined by explicit declarations and/or the name of the types. Nominal systems are used to determine if types are equivalent, as well as if a type is a subtype of another.
