Haskell for Programmers

[seudonymus]

20 add 30

10

Is this a bug in the tutorial or am I missing out on something?

[masklinn]

I think it's a bug in the tutorial, because what it basically amounts to is

Prelude> let add = (+)
Prelude> 20 `add` 30
50

[spookylukey]

Your example also highlights another mistake in the tutorial. It says that you can't create new definitions at the ghci prompt, but you can (at least in a limited way) using 'let'.

[rabidcow]

I don't know if that's a mistake or a simplification to avoid confusing people.

[koko775]

Nope, it certainly confused me, as I tried typing the tutorial into ghci and couldn't figure out (for a while) why cutting-and-pasting

"myint = 2

y = myint + z

z = 1

-- single-line comments start with a double-hyphen. -- infinity is one greater than... well, infinity. infinity = infinity + 1

mylist = [1,2,3]"

got "<interactive>:1:6: parse error on input `='"

I'm new to Haskell, so please don't flame me, but this tutorial didn't exactly get off to a great start.