CODEWITHSUNDEEP
haskell
JohnTeiMir
JohnTeiMir

Reputation: 35

Haskell positions in a string

I am trying to make a program that receives a string and returns the percentage of Cs and Gs in the first 5 and in the last 5 positions, if the string has less than 20 chars, the function should return the percentage in the complete sequence. However, I've already been able to get you to give me only the percentage of Cs and Gs, but I do not know how to check in the first 5 positions and the finals.

function' :: [Char] -> Double
function' xs = fromIntegral final0 / fromIntegral final1
                where final0 = length $ filter (\x-> x == 'C'|| x == 'G') xs
                      final1 = length xs

Upvotes: 0

Views: 220

Answers (1)

Izaak Weiss
Izaak Weiss

Reputation: 1310

You can get the fist 5 elements of a string s using take 5 s, and the last 5 using take 5 $ reverse s.

Upvotes: 2

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