Add minimumOn and maximumOn functions (Issue #331) #356
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Definition taken from issue #331
Since the type of the test inputs seems to not be constant, the function we sort on mush be trivial, meaning it has to be the identity
Bodigrim
reviewed
Jan 16, 2021
Bodigrim
reviewed
Jan 17, 2021
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Thanks for tests and benchmarks :) You are very welcome to contribute. |
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Thanks for adding this @claudi! :) |
Instead of having two synonyms for minimumOn and maximumOn, importing the Vector.Unboxed module in an intermediary and otherwise useless module, we can call the functions directly for the original module.
Took inspiration from the documentation for sortOn: https://hackage.haskell.org/package/base-4.14.1.0/docs/Data-List.html#v:sortOn
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Way to go with a first contribution @claudi Keep up the good work ;) Normally I'd also ask for an entry in changelog, but this time I'm gonna have to do it myself anyways, so no worries on it. |
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@lehins Too fast :) implementation doesn't match documentation @claudi never mind about bug. I'm going to add doctest for that behavior. This is good case for tool for copying haddocks I made. (Hasn't published it yet) |
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Should I fix the problem myself and submit another pull request? |
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@claudi please don't. Fix is trivial and I'm using this as test case for debugging tool for copying haddocks. Thanks for contribution! |
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@Shimuuar Good catch. |
This was referenced Jan 17, 2021
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Aug 19, 2022
# Changes in version 0.13.0.0
* `mkType` from `Data.Vector.Generic` is deprecated in favor of
`Data.Data.mkNoRepType`
* The role signatures on several `Vector` types were too permissive, so they
have been tightened up:
* The role signature for `Data.Vector.Mutable.MVector` is now
`type role MVector nominal representational` (previously, both arguments
were `phantom`). [#224](haskell/vector#224)
* The role signature for `Data.Vector.Primitive.Vector` is now
`type role Vector nominal` (previously, it was `phantom`).
The role signature for `Data.Vector.Primitive.Mutable.MVector` is now
`type role MVector nominal nominal` (previously, both arguments were
`phantom`). [#316](haskell/vector#316)
* The role signature for `Data.Vector.Storable.Vector` is now
`type role Vector nominal` (previous, it was `phantom`), and the signature
for `Data.Vector.Storable.Mutable.MVector` is now
`type role MVector nominal nominal` (previous, both arguments were
`phantom`). [#235](haskell/vector#235)
We pick `nominal` for the role of the last argument instead of
`representational` since the internal structure of a `Storable` vector is
determined by the `Storable` instance of the element type, and it is not
guaranteed that the `Storable` instances between two representationally
equal types will preserve this internal structure. One consequence of this
choice is that it is no longer possible to `coerce` between
`Storable.Vector a` and `Storable.Vector b` if `a` and `b` are nominally
distinct but representationally equal types. We now provide
`unsafeCoerce{M}Vector` and `unsafeCast` functions to allow this (the onus
is on the user to ensure that no `Storable` invariants are broken when
using these functions).
* Methods of type classes `Data.Vector.Generic.Mutable.MVector` and
`Data.Vector.Generic.Vector` use concrete monads (`ST`, etc) istead of being
polymorphic (`PrimMonad`, etc). [#335](haskell/vector#335).
This makes it possible to derive `Unbox` with:
* `GeneralizedNewtypeDeriving`
* via `UnboxViaPrim` and `Prim` instance
* via `As` and `IsoUnbox` instance: [#378](haskell/vector#378)
* Add `MonadFix` instance for boxed vectors: [#312](haskell/vector#312)
* Re-export `PrimMonad` and `RealWorld` from mutable vectors:
[#320](haskell/vector#320)
* Add `maximumOn` and `minimumOn`: [#356](haskell/vector#356)
* The functions `scanl1`, `scanl1'`, `scanr1`, and `scanr1'` for immutable
vectors are now defined when given empty vectors as arguments,
in which case they return empty vectors. This new behavior is consistent
with the one of the corresponding functions in `Data.List`.
Prior to this change, applying an empty vector to any of those functions
resulted in an error. This change was introduced in:
[#382](haskell/vector#382)
* Change allocation strategy for `unfoldrN`: [#387](haskell/vector#387)
* Remove `CPP` driven error reporting in favor of `HasCallStack`:
[#397](haskell/vector#397)
* Remove redundant `Storable` constraints on to/from `ForeignPtr` conversions:
[#394](haskell/vector#394)
* Add `unsafeCast` to `Primitive` vectors: [#401](haskell/vector#401)
* Make `(!?)` operator strict: [#402](haskell/vector#402)
* Add `readMaybe`: [#425](haskell/vector#425)
* Add `groupBy` and `group` for `Data.Vector.Generic` and the specialized
version in `Data.Vector`, `Data.Vector.Unboxed`, `Data.Vector.Storable` and
`Data.Vector.Primitive`. [#427](haskell/vector#427)
* Add `toArraySlice` and `unsafeFromArraySlice` functions for conversion to and
from the underlying boxed `Array`: [#434](haskell/vector#434)
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Implements the minimumOn and maximumOn function requested in the mentioned request, using the implementation described in the reply. It also adds tests, documentation and benchmarks for the mentioned functions.
This is my first contribution to an open source project. Hopefully everything is alright.