Date:         Tue, 4 Sep 2007 13:10:07 -0400
Reply-To:     Muthia Kachirayan <muthia.kachirayan@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Muthia Kachirayan <muthia.kachirayan@GMAIL.COM>
Subject:      Re: hash add method
Comments: To: "Richard A. DeVenezia" <rdevenezia@wildblue.net>
In-Reply-To:  <%FeDi.77$6V1.156806@news.sisna.com>
Content-Type: text/plain; charset=ISO-8859-1

On 9/4/07, Richard A. DeVenezia <rdevenezia@wildblue.net> wrote:
>
> Oft times a hash is simply used to test if a value is in some set.
>
> What I find peculiar is that when a hash has only keys, the .ADD method
> cannot be used if the key: tag is utilized!
>
> data _null_;
>
>   declare hash S();
>   S.defineKey('element');
>   S.defineDone();
>
>   element = 'a';
>   S.add();
>   element = 'b';
>   S.add();
>
>   if S.find(key:'c') ne 0 then
>     put "'c' is not in S";
>
>   * key: tag causes an error !;
>   S.add(key:'c');
>
>   if S.find(key:'c') eq 0 then
>     put "'c' is in S";
>
>   stop;
> run;
>
> Does such an error seem reasonable ? Not to me :(
>
> Another interesting quirk, when a hash has only keys, the OUTPUT method
> writes out the key values.  When a hash hash keys and data, only the data
> is
> written out.
>
> --
> Richard A. DeVenezia




Richard,

 .add() is not liked but it likes  ...

if S.find(key:'c') ne 0 then S.replace();

There is no error message !!

Regards,

Muthia Kachirayan