Re: [Haskell-beginners] print all days of calendar

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Datum: Mon, 21 Dec 2009 17:22:18 +0100 Von: Daniel Fischer An: beginners@haskell.org CC: kane96@gmx.de Betreff: Re: [Haskell-beginners] print all days of calendar

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Datum: Mon, 21 Dec 2009 11:53:02 +0100 Von: Daniel Fischer An: beginners@haskell.org CC: kane96@gmx.de Betreff: Re: [Haskell-beginners] print all days of calendar

Am Montag 21 Dezember 2009 11:38:14 schrieb kane96@gmx.de:

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Which function can I use to trim the calendar of a month from the

calendar

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of the whole year, because I have to implement a function: getMonth :: Month -> Calendar -> Calendar

look at filter or span and break, takeWhile/dropWhile

Dont't find any good examples of this functions that can help me. I

Am Montag 21 Dezember 2009 17:04:56 schrieb kane96@gmx.de: think

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it have to be somethink like that, but don't find a way that works: getMonth :: Month -> Calendar -> Calendar getMonth month year = filter ([1..31],month,year) (calendar year)

Prelude> :t filter filter :: (a -> Bool) -> [a] -> [a]

So we need a predicate on the type of list elements.

getMonth month cal = filter predicate cal where predicate (d,m,y) = ??

it has to match the given month and year. But don't know how to define it. -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01