Using Haskell’s map function to calculate the sum of a list

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You can’t really use map to sum up a list, because map treats each list element independently from the others. You can use map for example to increment each value in a list like in 

map (+1) [1,2,3,4] -- gives [2,3,4,5]

Another way to implement your addm would be to use foldl:

addm' = foldl (+) 0

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