On Saturday 12 June 2010 22:09:48, bitur mail wrote:

Hello,

This is a dumb question but ...

I'm just starting with the book Real World Haskell, and in chapter 2 it mentions that "Haskell doesn't have a notion of a one-element tuple".

I am confused by this because I type, for example, (143), into the interpreter and it does not complain. What does Haskell consider (143) to be?

An ordinary value, enclosed in parentheses. Prelude> :t (143) (143) :: (Num t) => t Prelude> (143) == 143 True That's different to e.g. Python:

...

...

x = (3,) len(x) 1 type(x) x == 3 False

which has a notion of 1-tuples having a type different from the type of their components.

Thanks :) DG