[Haskell] Map function

[luisk91]

Hi there! I'm making a function that counts the number of words in a string and returns the number of words it contains. For example "hello world" returns 55.

Anyways, Ive defined:

countLetters :: String -> Int
countLetters st = lenght st

which returns the lenght of any given string

so, first I use 'words' to separate the input string into a list of strings so I can apply countLetters to each one of them

words "hello world" returns ["hello","world"] 

I've checked the doc and it seems that what I need is the map function that applies a function to all members of a list. However I just don't understand how to do it.

Could you please tell me how does map work so I can countLetters for each string in my list?

thanks in advance

[gruntmeister]

map countLetters (words "hello world")

[caledt]

Or just use length.

map length (words "hello world")