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POHaskell - declare/use data
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  1. POHaskell - declare/use data
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    copied!<p>It's my first time to use data types in Haskell. Got a problem and I don't know how to improve the code.</p> <p>Here is the problem:</p> <p>Declear a data type called "Consonant" which include some letters(string), and an textstring which got the information about if all the letters in that word are consonant or not (string), then write a function "Cheak" which got indata (some letters to cheak) and outdata (the data type "Consonant").</p> <p>Here is my code:</p> <pre><code>module Consonant where import Char type Name = String type ConOrNot = String data Consonant = Cons Name ConOrNot deriving (Show,Eq) isVowel = "AEIOU" cheak :: String -&gt; Consonant cheak [] = "" cheak (char:chars) = if elem (toUpper char) isVowel == false then cheak chars else cheak = Cons (char:chars) "Not Consonant" -- here I want to use "break", but I don't know how to use it in Haskell... cheak = Cons (char:chars) "Is Consonant" </code></pre> <p>It doesn't work... How to change the code? Pls help! Thank you!</p> <p>Update:</p> <pre><code> module Consonant where import Char type Word = String type ConOrNot = String data Consonant = Cons Word ConOrNot deriving (Show,Eq) isConsonant = "BCDFGHJKLMNPQRSTVWXYZ" cheak :: String -&gt; Consonant cheak [] = Cons "" "" cheak (char:chars) |elem (toUpper char) isCosonant = cheak chars --if all the letters are cosonant, I want it return (Cons (char:chars) "is Consonant").. still working on it |otherwise = Cons (char:chars) "Not Consonant" </code></pre> <p>It works now if the string got both vowels and consonant or only vowels, how to improve the code so it also works with only consonants?</p>
 

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