Gjuro Chensen wrote:
Hello everyone!
Im a Haskell newbie, and Ive have few unanswered questions. For someone more experienced (at least I think so) its a very simple task, but I just cant get a grip on it and its pretty frustrating. It wouldn't be that bad if I haven't browse thru bunch of pages and tutorials and still nothing... The problem is: take a string, and if every words starts with uppercase letter then print yes, else no. Forum Text Bold -> yes Frog image File -> no
Ive had my share of approaches to this, but I just cant make it work. Standard one seemed the most simple:
search :: String -> String search [] = []
and then use words (splits string on space) to split the string so I could get a list and go through it recursively. But how to apply words to entered string in this form?
To find the first letter I came up with: first = take 1 (head x). And compare it with elem or ASCII values to determine if its upper case.
The idea of using `words' is very good. If we want to use a bottom-up approach, we should have a function that determines if a word starts with an upper-case letter, i.e. a function of type startsWithUppercase :: String -> Bool startsWithUppercase = ... (Hint: look at 'isUpper' from Data.Char) Now we need a way to see if for each word, some predicate is satisfied. There is a standard function for this, "all". You can also do this by using "map" and "and". The resulting function can be very concise if you get the hang of it :) Regards, -- Jochem Berndsen | jochem@functor.nl GPG: 0xE6FABFAB