Question

Currently I am doing something like this in my code:

--Generate a list of n 'Foo's
generateFoos n = [createFoo (show i) | i <- [1..n]]

-- Create a Foo with a given name
createFoo :: String -> Foo

I was wandering if there is a another way of doing this than creating a range [1..n] all the time…

Answer 1

I would say don’t worry about it. “Creating the range [1..n]” isn’t really going on here as a distinct step; that [1..n] desugars to enumFromTo 1 n and it’s constructed lazily like everything else anyway. There’s no hidden cost here one would need to eliminate.