Re: pattern matching

Some of it I got, and some I didn't.  But here's a question.  In pattern
matching, can I simply write [head]?  Or am I obligated to write head :: [
].  They're interchangeable, right?  ( Although the syntax may require one
rather than the other.  I would have to experiment with it to find out. )

On Tue, Mar 29, 2016 at 4:02 AM, 'Mr. Herr' [email protected]
[ocaml_beginners] <[email protected]> wrote:

>
>
> sorry, overlooked sub matching.
>
> You can match several elements in one pattern, just take care to have the
> "shorter" cases first.
>   | []  ->
>   | head :: [] -> (* equivalent to [head], all list patterns can be
> written with square brackets *)
>   | head :: second :: rest -> (* here rest can be [] *)
>
> This sounds like you did not understand the explanations I gave.
>
> /Str.
>
> On 29.03.2016 10:18, 'Mr. Herr' [email protected] [ocaml_beginners]
> wrote:
>
>
>
>
>
> On 29.03.2016 06:41, Douglas Lewit [email protected] [ocaml_beginners]
> wrote:
>
>
> I also gave something like this a try, but I ended up with a couple of
> error messages:
>
> *let pack list = match list with*
> *|[ ] -> [ ]*
> *|head :: tail -> match tail with*
> *|[ ] -> [ ]*
> *headOfTail :: tailOfTail -> if head = headOfTail then..... ( more code )*
>
> I thought it was clever, but either I just ended up with an empty list, a
> one-element list, or the compiler just rejected it.  I'm starting to feel a
> little dumb!  But I'll keep at it.
>
> tailOfTail is a list, not an element!
>
> /Str.
>
>
> 
>