Using map, filter, and . (function composition operator), define a function that

Question

Using map, filter, and . (function composition operator), define a function that examines a list of strings, keeping only those whose length is odd, converts them to upper case letters, and concatenates the results to produce a single string. concatenateAndUpcaseOddLengthStrings :: [String] -> String You need to import Data.Char in order to use the toUpper function (see the skeleton code).

skelton for this problem:

concatenate :: [String] -> String
concatenate xs = foldl(++) "" xs  

-- Problem 6
concatenateAndUpcaseOddLengthStrings :: [String] -> String
concatenateAndUpcaseOddLengthStrings = undefined

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Explanation / Answer

CODE:

module Main where
import Data.Char -- for toUpper


concatenateAndUpcaseOddLengthStrings :: [String] -> String
concatenateAndUpcaseOddLengthStrings [] = ""
concatenateAndUpcaseOddLengthStrings xs = map toUpper (concatenate ([y | y<-xs, odd (length y)])

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