FP Laboratory 5

List comprehension

Using the list comprehension implement following functions:

• Create a function that generates a list of all odd numbers in given interval.

oddList :: Int -> Int -> [Int]

• Create a function that takes a string and converts all characters to upper case letters.

allToUpper :: String -> String

• Create a function that removes all upper case letters from a string.

removeAllUpper :: String -> String

• Create functions that computes union and intersection of two sets.

union :: [a] -> [a] -> [a]
intersection :: [a] -> [a] -> [a]

More complex functions

• Create a function that count the number of occurrences of all characters from a given string.

countThem :: String -> [(Char, Int)]

*Main>countThem "hello hello hello"
[('h',3),('e',3),('l',6),('o',3),(' ',2)]

• Create a function that generates all combinations of given length from the characters from given string.

combinations :: Int -> String -> [String]

*Main> combinations 3 "abcdef"
["abc","abd","abe",...]