Haskell provides abs function, which returns the absolute value of a number. Following is the signature of abs function.
Prelude> :t abs
abs :: Num a => a -> a
As you see the signature, abs takes any value which is of number type and return the absolute value.
Prelude> abs 10
10
Prelude> abs (-10)
10
Prelude> abs 10.01
10.01
Prelude> abs (-10.01)
10.01
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