Hey there, I've got a method: demaybefy :: [Maybe a] -> [a] demaybefy [] = [] demaybefy (x:xs) = case x of Just x -> x : demaybefy xs Nothing -> demaybefy xs However, i feel that there is a method from preload/list/maybe that does exactly the same, but i cannot find it. Can someone help me? best regards Leonhard
Hi Leonhard, the function is called catMaybes. Hoogle is a good way to find it: https://hoogle.haskell.org/?hoogle=%5BMaybe+a%5D+-%3E+%5Ba%5D Cheers, Simon Am Mi., 1. Mai 2019 um 13:05 Uhr schrieb Leonhard Applis < Leonhard.Applis@protonmail.com>:
Hey there,
I've got a method:
*demaybefy* :: [Maybe a] -> [a] demaybefy [] = [] demaybefy (x:xs) = case x of Just x -> x : demaybefy xs Nothing -> demaybefy xs
However, i feel that there is a method from preload/list/maybe that does exactly the same, but i cannot find it. Can someone help me?
best regards Leonhard _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
Hello Leonard, On Wed, May 01, 2019 at 11:04:46AM +0000, Leonhard Applis wrote:
I've got a method:
demaybefy :: [Maybe a] -> [a] [...]
However, i feel that there is a method from preload/list/maybe that does exactly the same, but i cannot find it. Can someone help me?
Simon already gave the right answer; never forget that for question like this, Hoogle is phenomenal! Just write in the sought signature and voila: https://hoogle.haskell.org/?hoogle=%5BMaybe%20a%5D%20-%3E%20%5Ba%5D
Also in general form. https://hackage.haskell.org/package/witherable-0.3/docs/Data-Witherable.html... On 1/5/19 10:56 pm, Francesco Ariis wrote:
Hello Leonard,
I've got a method:
demaybefy :: [Maybe a] -> [a] [...]
However, i feel that there is a method from preload/list/maybe that does exactly the same, but i cannot find it. Can someone help me? Simon already gave the right answer; never forget that for question like
On Wed, May 01, 2019 at 11:04:46AM +0000, Leonhard Applis wrote: this, Hoogle is phenomenal! Just write in the sought signature and voila:
https://hoogle.haskell.org/?hoogle=%5BMaybe%20a%5D%20-%3E%20%5Ba%5D _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
participants (4)
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Francesco Ariis -
Leonhard Applis -
Simon Jakobi -
Tony Morris