High order function beggining doubt

Igor Pinheiro Leão

3 Jul 2013 3 Jul '13

7:40 p.m.

Hi there, let a function whith the following signature: annexer :: (b -> c) -> [a -> b] -> [a -> c] How can i do that? Kind regards, Igor -- Igor Vinícius Graduando em Ciência da Computação

Attachments:

attachment.html (text/html — 365 bytes)

Show replies by date

Igor Pinheiro Leão

3 Jul 3 Jul

7:42 p.m.

Oops, my bad. *with. 2013/7/3 Igor Pinheiro Leão

...

Hi there, let a function whith the following signature: annexer :: (b -> c) -> [a -> b] -> [a -> c] How can i do that?

Kind regards, Igor

-- Igor Vinícius Graduando em Ciência da Computação

-- Igor Vinícius Graduando em Ciência da Computação

David Flicker

7:46 p.m.

Hey Igor, Try using a map and then the function composition operator ".". Something like annexer func list = map (\x -> (func . x)) list Kind regards, David On Wed, Jul 3, 2013 at 7:42 PM, Igor Pinheiro Leão wrote:

...

Oops, my bad. *with.

2013/7/3 Igor Pinheiro Leão

...
Hi there, let a function whith the following signature: annexer :: (b -> c) -> [a -> b] -> [a -> c] How can i do that?

Kind regards, Igor

-- Igor Vinícius Graduando em Ciência da Computação

-- Igor Vinícius Graduando em Ciência da Computação

_______________________________________________ Beginners mailing list Beginners@haskell.org http://www.haskell.org/mailman/listinfo/beginners

Igor Pinheiro Leão

7:59 p.m.

Thank you Emanuel and David! It worked. Now I have to google in order to better understand function composition. Best, Igor 2013/7/3 David Flicker

...

Hey Igor,

Try using a map and then the function composition operator ".". Something like

annexer func list = map (\x -> (func . x)) list

Kind regards,

David

On Wed, Jul 3, 2013 at 7:42 PM, Igor Pinheiro Leão wrote:

...
Oops, my bad. *with.

2013/7/3 Igor Pinheiro Leão

...
Hi there, let a function whith the following signature: annexer :: (b -> c) -> [a -> b] -> [a -> c] How can i do that?

Kind regards, Igor

-- Igor Vinícius Graduando em Ciência da Computação

-- Igor Vinícius Graduando em Ciência da Computação

_______________________________________________ Beginners mailing list Beginners@haskell.org http://www.haskell.org/mailman/listinfo/beginners

_______________________________________________ Beginners mailing list Beginners@haskell.org http://www.haskell.org/mailman/listinfo/beginners

-- Igor Vinícius Graduando em Ciência da Computação

Emanuel Koczwara

7:47 p.m.

Hi, Try this: annexer a b = map (a.) b Best regards, Emanuel

4338

Age (days ago)

4338

Last active (days ago)

List overview

Download

4 comments

3 participants

participants (3)

David Flicker
Emanuel Koczwara
Igor Pinheiro Leão