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Pretty much what the title says. I have a list of Integers like so: [1,2,3]. I want to change this in to the Integer 123. My first thought was concat but that doesn't work because it's of the wrong type, I've tried various things but usually I just end up returning the same list. Any help greatly appreciated.
Also I have found a way to print the right thing (putStr) except I want the type to be Integer and putStr doesn't do that.
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Use int() function to Convert list to int in Python. This method with a list comprehension returns one integer value that combines all elements of the list.
The ++ operator is the list concatenation operator which takes two lists as operands and "combine" them into a single list. So if you have the list [x] and the list [y] then you can concatenate them like this: [x]++[y] to get [x, y ]. Notice that : takes an element and a list while ++ takes two lists.
You could concat the string representations of the numbers, and then read them back, like so:
joiner :: [Integer] -> Integer
joiner = read . concatMap show
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