+1
Am Mi., 11. Sept. 2019 um 01:41 Uhr schrieb chessai . : I would also prefer if (&) and `for` were exported from the Prelude. On Tue, Sep 10, 2019, 9:33 PM Elliot Cameron Hilariously, I'm mild -1 on this. Haskell is an extremely import-heavy
language. Anyone who isn't willing to just write their own mini-Prelude
should be ready to import things like `on`. Why isn't `for` exported in
Prelude? What about `&`? Both of these are extremely useful and common,
even moreso than *on*! And their implementation is *even shorter*. It's a
slippery slope. On Tue, Sep 10, 2019 at 6:59 PM David Feuer Indeed, there are a lot more conflicts than I'd have expected. Ignoring
functions with the same type, Hoogle shows this name in the below packages.
I have no sense of the overall significance of the specific packages or
(equally importantly) of the `on` function within each. haskell-gi-base:
on :: forall object info m . (GObject object, MonadIO m, SignalInfo
info) => object -> SignalProxy object info -> HaskellCallbackType info -> m
SignalHandlerId brick:
on :: Color -> Color -> Attr esqueletto:
on :: SqlExpr (Value Bool) -> SqlQuery () relational-query (both):
on :: MonadQuery m => Predicate Flat -> m ()
on :: MonadQuery m => QueryA m (Predicate Flat) () threepenny-gui:
on :: (element -> Event a) -> element -> (a -> UI void) -> UI () miso:
on :: MisoString -> Decoder r -> (r -> action) -> Attribute action wild-bind:
on :: i -> v -> Binder i v () massiv-io:
on :: Pixel X Bit selda-postgresql:
on :: Text -> Text -> PGConnectInfo On Tue, Sep 10, 2019, 6:42 PM Ryan Trinkle One note: this does conflict with some other libraries, for instance
GTK2HS On Tue, Sep 10, 2019 at 6:26 PM chessai . +1 On Tue, Sep 10, 2019, 5:53 PM David Feuer Every time I reach for Data.Function.on, I feel like a total dolt for
having to import a module to get a function whose implementation is barely
longer than the import. And it's a really good function too! Can we please
add it to the Prelude? on :: (b -> b -> c) -> (a -> b) -> a -> a -> c
(.*.) `on` f = \x y -> f x .*. f y
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