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Fantasy Land Specification download for Linux

Free download Fantasy Land Specification Linux app to run online in Ubuntu online, Fedora online or Debian online

This is the Linux app named Fantasy Land Specification whose latest release can be downloaded as Version5.0.1.zip. It can be run online in the free hosting provider OnWorks for workstations.

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Fantasy Land Specification


This project specifies interoperability of common algebraic structures like Setoid, Ord, Semigroupoid, Category, Semigroup, Monoid, Group, Filterable, Functor, Contravariant, Apply, Applicative, etc. An algebra is a set of values, a set of operators that it is closed under and some laws it must obey. Each Fantasy Land algebra is a separate specification. An algebra may have dependencies on other algebras which must be implemented. "Value" is any JavaScript value, including any which have the structures defined below. "Equivalent" is an appropriate definition of equivalence for the given value. The definition should ensure that the two values can be safely swapped out in a program that respects abstractions. For example, two lists are equivalent if they are equivalent at all indices, two plain old JavaScript objects, interpreted as dictionaries, are equivalent when they are equivalent for all keys, two promises are equivalent when they yield equivalent values, etc.


  • Each Fantasy Land algebra is a separate specification
  • Certain behaviours are defined from the perspective of a member of a type
  • Other behaviours do not require a member
  • Certain algebras require a type to provide a value-level representative
  • If a data type provides a method which could be derived, its behaviour must be equivalent to that of the derivation
  • It is recommended to throw an exception on unspecified behaviour

Programming Language



Mathematics, Libraries

This is an application that can also be fetched from https://sourceforge.net/projects/fantasy-land-spec.mirror/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.

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