Re: [Haskell-cafe] some ideas for Haskell', from Python

2009/1/14 Tim Wawrzynczak :

The reason the macro is better is that the length of the list is known at compile time, so you don't need to traverse the list to calculate the length of the list.

Or you could use a real compiler (perhaps even a glorious one) that does constant folding when the list length is constant, but have your function still work when it isn't constant. --Max