Type theory

Type variable

In type theory and programming languages, a type variable is a mathematical variable ranging over types. Even in programming languages that allow mutable variables, a type variable remains an abstraction, in the sense that it does not correspond to some memory locations. Programming languages that support parametric polymorphism make use of universally quantified type variables. Languages that support existential types make use of existentially quantified type variables. For example, the following OCaml code defines a polymorphic identity function that has a universally quantified type, which is printed by the interpreter on the second line: # let id x = x;;val id : 'a -> 'a = In mathematical notation, the type of the function id is , where is a type variable. (Wikipedia).

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This video defines a variable and provides examples of a variable used as a changing value or a placeholder http://mathispower4u.com

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VARIABLES in Statistical Research (2-1)

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More videos like this online at http://www.theurbanpenguin.com Understanding variable scope in Java. We take a quick look at Class, Instance and Local variables and see how scope affects their access.

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Related pages

Parametric polymorphism | Type theory | Identity function | System F | Existential type | Variable (mathematics)