CODEWITHSUNDEEP
listhaskell
Prototype
Prototype

Reputation: 114

Merge list haskell

I have two lists for example: [1,2,3,4,5] and [1,2,3,4,5] and I want to merge them to [2,4,6,8,10]. Is there an easy way to do this in haskell since there aint traditional loops? Assume that both lists will be same size

Upvotes: 0

Views: 161

Answers (1)

lisyarus
lisyarus

Reputation: 15586

Haskell doesn't have traditional loops, but it does have recursion:

foo :: [Integer] -> [Integer] -> [Integer]
foo [] [] = []
foo (x:xs) (y:ys) = x+y : foo xs ys

Or, as suggested by Willem Van Onsem, you can just use the function zipWith:

foo = zipWith (+)

Note that if you don't specify the exact type of foo, it will be infered as

foo :: (Num a) => [a] -> [a] -> [a]

Upvotes: 3

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