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2.1 Data constructors as first class values ... 2.2 Data constructors are not types ... 3 Deconstructing data constructors...
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A type constructor or class can be an operator, beginning with a colon; e.g. :*:. The lexical syntax is the same as that for data constructors.
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Algebraic data type - Wikipedia, the free encyclopedia
In computer programming, an algebraic data type (sometimes also called a variant type ) is a datatype each of whose values is data from other datatypes wrapped in one of the constructors of the da...
en.wikipedia.org/wiki/Algebraic_data_type |
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Although the goals and means of rule-based and data-based systems are too different to be fully integrated at the present time, it seems appropriate to investigate a closer integration of language constructs and a better cooperation of execution models for both kinds of approaches.
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Haskell calls this pattern "Existential Data Construction."; In A History of Haskell: Being Lazy With Class , Hudak, Hughes, Wadler, and Jones provide the following Haskell datatype as motivation for existential data constructors.
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2.5 Data constructors and pattern matching ... As in most functional languages, data constructors are used both to construct values and to deconstruct them. ... Most constants and data constructors are defined as part of concrete type definitions. Moby provides three kinds of concrete type definition: datatypes, enumerations,
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This chapter describes the support for the Resource Description Framework (RDF) in the Oracle Spatial network data model. It assumes that you are familiar with the major concepts associated with RDF, such as reification, containers, and collections. ... Section 1.4, "RDF Data Types, Constructors, and Methods"
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This pattern contains a proposal for denoting constraints such as free term generation, reachability, and constructors with axioms by special abbreviations in data type definitions.
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The following are alternative forms for array constructors: o Square brackets (instead of parentheses and slashes) to enclose array constructors; ... for example, the following two array constructors are equivalent: INTEGER C(4) C = (/4,8,7,6/) C = [4,8,7,6] o A colon-separated triplet (instead of an implied-do loop) to...
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Feb 5, 2009 ... Data Constructors and Readability. I think I've put my finger on one reason I'm finding Haskell hard to read. Consider this algebraic data ...
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