Fix toEnum for (Maybe a) #20
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paf31
reviewed
Nov 10, 2016
| to _ 0 = Nothing | ||
| to (Cardinality ca) n | n <= ca = Just $ toEnum (n - 1) | ||
| to _ 0 = Just Nothing | ||
| to (Cardinality ca) n | n > 0 && n <= ca = Just $ toEnum (n - 1) |
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Why are we even doing a check here? Why not just let the call to toEnum fail?
toEnum 0 = pure Nothing
toEnum n = Just <$> toEnum (n - 1)
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@paf31 much better :) |
2 tasks
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Thanks! @garyb, any comments on this? Looks good to me. |
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Nope, looks great! |
JordanMartinez
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Dec 25, 2020
* first commit * Fix instances for record fields * Break modules up * Deriving Show (#5) * Initial work on deriving Show * Add test for Show * Remove import * Travis etc. * Data.Generic.Rep.Bounded (#6) * Data.Generic.Rep.Bounded Generic implementations of Prelude.Bounded class's top and bottom. * GenericBounded - don't support product types * GenericBounded - only support NoArguments * Update for PureScript 0.11 * Add Generic instance for Maybe (#9) * Add missing Bounded instances for Argument * Add GenericEnum and GenericBoundedEnum * Add enum tests, convert existing "tests" into assertions * Product instances in Bounded and Enum * Added GenericShowFields instances for NoConstructors and NoArguments (#20) * Added Eq and Show instances to NoArguments and NoConstructors * Added GenericShowFields * Removed Show, Eq * Cleanup * Removed NoConstructors Show instance * Remove Rec and Field & update package & bower symbols * Bump deps for compiler/0.12 * Remove symbols and fix operator fixity issue * Update dependencies, license * Added HeytingAlgebra, Semiring, Ring * Fix type annotation precedence in tests * Replace monomorphic proxies by Type.Proxy.Proxy (#44) * Move Enum file to Data.Enum.Generic * Update module name to match file name for Enum * Update module path for Bounded Generic * Move test file to Data.Enum folder and rename to Generic.purs * Remove code unrelated to Enum in test file * Update Generic X module names to Data.X.Generic * Rename `main` function in test file to testGenericEnum * Update module name in test file to match file name * Remove all files in repo that are unrelated to Enum Generic * Include Enum's Generic tests in repo's tests * Remove unused logShow Co-authored-by: Phil Freeman <paf31@cantab.net> Co-authored-by: Matthew Leon <ml@matthewleon.com> Co-authored-by: Gary Burgess <gary.burgess@gmail.com> Co-authored-by: Liam Goodacre <goodacre.liam@gmail.com> Co-authored-by: Jorge Acereda <jacereda@gmail.com> Co-authored-by: Kristoffer Josefsson <kejace@gmail.com> Co-authored-by: Denis Stoyanov <stoyanov.gr@gmail.com> Co-authored-by: Harry Garrood <harry@garrood.me> Co-authored-by: Cyril <sobierajewicz.cyril@gmail.com>
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