Re: [haskell-exercises] Functions

[David Tchepak]

Can you clarify what you're trying to do?

Do you want to transform [(1,2), (3,4)]  to [3, 7] ? Or are you working with two lists?

On Fri, Nov 3, 2017 at 3:24 AM, Mirasol Davila <mirasol...@gmail.com> wrote:

I can't seem to use map to get the sum of the numbers in the tuples. How would you combine map with zip?

zip' :: [a] -> [b] -> [(a,b)]

zip' _ [] = []

zip' [] _ = []

zip' (x:xs) (y:ys) = (x, y):zip' xs ys

    where map (\(x,y) -> x + y)

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[Tony Morris]

zipWith (+) [4,5,6,7] [8,6,4,5] 

On 3 Nov. 2017 10:30, "Mirasol Davila" <mirasol...@gmail.com> wrote:

I'm working with two lists so an example could be [4,5,6,7] [8,6,4,5] and when we use zip' we will get [(4,8), (5,6), (6,4), (7,5)] then I want to use map that sums the number of each tuple which in this case would be [12,11,10,12]. I just don't understand how to combine map into the zip' function.

On Thursday, November 2, 2017 at 3:33:10 PM UTC-7, David Tchepak wrote:

Can you clarify what you're trying to do?

Do you want to transform [(1,2), (3,4)]  to [3, 7] ? Or are you working with two lists?

On Fri, Nov 3, 2017 at 3:24 AM, Mirasol Davila <mirasol...@gmail.com> wrote:

I can't seem to use map to get the sum of the numbers in the tuples. How would you combine map with zip?

zip' :: [a] -> [b] -> [(a,b)]

zip' _ [] = []

zip' [] _ = []

zip' (x:xs) (y:ys) = (x, y):zip' xs ys

    where map (\(x,y) -> x + y)

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[David Tchepak]

I'd avoid thinking about combining map *into* zip', and more combining map *with* zip'.

You've done the first bit: zip' [4,5,6,7] [8,6,4,5] = [(4,8), (5,6), (6,4), (7,5)].

Now you want a function along the lines of [(Int, Int)] -> [Int], which you wrote in your original post: map (\(x,y) -> x + y).

The final operation is then something like:

myFn :: [Int] -> [Int] -> [Int]

myFn xs ys = _useMapHere (zip' xs ys)

Hope that helps get you unstuck.

On Fri, Nov 3, 2017 at 11:30 AM, Mirasol Davila <mirasol...@gmail.com> wrote:

I'm working with two lists so an example could be [4,5,6,7] [8,6,4,5] and when we use zip' we will get [(4,8), (5,6), (6,4), (7,5)] then I want to use map that sums the number of each tuple which in this case would be [12,11,10,12]. I just don't understand how to combine map into the zip' function.

On Thursday, November 2, 2017 at 3:33:10 PM UTC-7, David Tchepak wrote:

Can you clarify what you're trying to do?

Do you want to transform [(1,2), (3,4)]  to [3, 7] ? Or are you working with two lists?

On Fri, Nov 3, 2017 at 3:24 AM, Mirasol Davila <mirasol...@gmail.com> wrote:

I can't seem to use map to get the sum of the numbers in the tuples. How would you combine map with zip?

zip' :: [a] -> [b] -> [(a,b)]

zip' _ [] = []

zip' [] _ = []

zip' (x:xs) (y:ys) = (x, y):zip' xs ys

    where map (\(x,y) -> x + y)

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