Contribution:
haskellMonoid
Headline
Modeling queries in Language:Haskell with the help of monoids
Characteristics
Several functional requirements are implemented while making explicit use the monoids. For instance, Feature:Total is implemented with the help of the sum monoid. Only those functional requirements are implemented that indeed may benefit from monoids as such. For instance, Feature:Cut is not implemented.
Illustration
Consider the implementation of Feature:Total:
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That is, lists of departments and employees are processed by the map function resulting in lists of intermediate results in the monoid's Sum type to be reduced accordingly by the monoid's mconcat operation, which, in turn, is uniformly defined by applying the fold function to the monoid's binary operation and its identity.
Relationships
- The data model of Contribution:haskellComposition is reused.
- See Contribution:haskellProfessional for an implementation of all relevant features without the use of monoids.
Architecture
There are these modules:
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: a data model for Feature:Hierarchical company
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: a sample company
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: the implementation of Feature:Total
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: the implementation of Feature:Depth
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: the implementation of Feature:Ranking
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: a monoid for optional maxima
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: Tests
The types of
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implement Feature:Closed serialization through Haskell's read/show.
Usage
See https://github.com/101companies/101haskell/blob/master/README.md.
Kevin
edited this article at
Fri, 02 Jun 2017 00:10:09 +0200
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For you are available next options:will make text bold.
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