Re: [Haskell] Haskell [x] and x notation - as-pattern example

Hi Angus, Angus Comber wrote:

Also xs is of what type? list of values? So does this mean x is an element and xs must be of type list? Confused...

Here is how you can use ghci to investigate such questions:

...

ghci GHCi, version 7.4.2: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done.

Prelude> let all@(x:xs) = "hello world"

Prelude> x 'h'

Prelude> xs "ello world"

Prelude> all "hello world"

Prelude> :t x x :: Char

Prelude> :t xs xs :: [Char]

Prelude> :t all all :: [Char]

Prelude> x 'h'

Prelude> [x] "h"

Prelude> :t x x :: Char

Prelude> :t [x] [x] :: [Char]

Prelude> :q Leaving GHCi.

Tillmann PS. The haskell@haskell.org list is mostly for announcements, so questions like this are better suited for beginners@haskell.org or haskell-cafe@haskell.org.