Currying subtraction

Question

If we want to map a function that increases every element of a range by 1, we could write

map (\\x -> x + 1) [1..5]

but I guess most peo

Answer 1

Since - is both the infix subtract and the prefix negate, you can't use the (*x) (where * is an infix operator and x a value) syntax for -. Luckily Prelude comes with negate and subtract, which is \x -> -x and \x y -> y-x respectively, so that you may use those where you need to differentiate between the two.