Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Option_type> ?p ?o. }
Showing items 1 to 15 of
15
with 100 items per page.
- Option_type abstract "In programming languages (especially functional programming languages) and type theory, an option type or maybe type is a polymorphic type that represents encapsulation of an optional value; e.g. it is used as the return type of functions which may or may not return a meaningful value when they are applied. It consists of either an empty constructor (called None or Nothing), or a constructor encapsulating the original data type A (written Just A or Some A). Outside of functional programming, these are known as nullable types.In the Haskell language, the option type (called Maybe) is defined as data Maybe a = Just a | Nothing. In the OCaml language, the option type is defined as type 'a option = None | Some of 'a. In the Scala language, Option is defined as parametrized abstract class '.. Option[A] = if (x == null) None else Some(x)... In the Standard ML language, the option type is defined as datatype 'a option = NONE | SOME of 'a. In the Rust language, it is defined as enum Option<T> { None, Some(T) }.In type theory, it may be written as: .In languages that have tagged unions, as in most functional programming languages, option types can be expressed as the tagged union of a unit type plus the encapsulated type.In the Curry-Howard correspondence, option types are related to the annihilation law for ∨: x∨1=1.An option type can also be seen as a collection containing either a single element or zero elements.".
- Option_type wikiPageExternalLink Option.html.
- Option_type wikiPageID "22774540".
- Option_type wikiPageRevisionID "597201861".
- Option_type hasPhotoCollection Option_type.
- Option_type subject Category:Data_types.
- Option_type subject Category:Functional_programming.
- Option_type subject Category:Type_theory.
- Option_type comment "In programming languages (especially functional programming languages) and type theory, an option type or maybe type is a polymorphic type that represents encapsulation of an optional value; e.g. it is used as the return type of functions which may or may not return a meaningful value when they are applied. It consists of either an empty constructor (called None or Nothing), or a constructor encapsulating the original data type A (written Just A or Some A).".
- Option_type label "Option type".
- Option_type sameAs m.05zxhs9.
- Option_type sameAs Q7099015.
- Option_type sameAs Q7099015.
- Option_type wasDerivedFrom Option_type?oldid=597201861.
- Option_type isPrimaryTopicOf Option_type.