Tim,
Thanks so much!
If you won't mind could you throw more light on this:
"Also, I recommend that you familiarize yourself with
the rebol function interface dialect."
I would like to see examples.
Regards,
Emeka
On Thu, Sep 9, 2010 at 8:28 PM, Tim Johnson <[email protected]> wrote:
>
> * Emeka <[email protected]> [100909 09:59]:
> > Hello All,
> >
> > I have the below solution, but I want something better.
> >
> >
> > Ismember?: func[my-list start-n n t-element][
> > first-element: first at my-list start-n
> > if t-element = first-element [return true]
> > if start-n = n [return false]
> > Ismember? my-list ADD start-n 1 n t-element
> > ]
> The last line:
> > Ismember? my-list ADD start-n 1 n t-element
>
> would be better coded:
> Ismember? my-list (ADD start-n 1) n t-element
> for readability, precedence and disclosure of intent.
>
> Also, I recommend that you familiarize yourself with
> the rebol function interface dialect.
>
> IOWS, you can control the data sent to the function
> by specifying the datatypes of the arguments
>
> Example:
> Ismember?: func[my-list[block!] start-n[integer!] n[integer!]
> t-element[any-type!]][
> ;; .... code here
> ]
> This approach has at least two advantages:
> 1)Clarifies the intent of the function
> 2)Generates error messages at the function call rather than
> somewhere down the road where some side effect kicks in as
> a result of an unintended argument type.
>
> I hope this helps. If I have confused the issue more, :) I can
> elaborate.
> tim
>
> > On Thu, Sep 9, 2010 at 6:38 PM, Emeka <[email protected]> wrote:
> >
> > >
> > > Hello All,
> > >
> > > Which word would I use for something like this? I have a block [ A B C
> D] ,
> > > I would like to do
> > > Ismember? [A B C D] D comes true because D is in the block already ,
> but
> > > Ismember?{A B C D] F comes false.
> > >
> > >
> > > Regards,
> > > Emeka
> > >
> > > --
> > > *Satajanus Nig. Ltd
> > >
> > >
> > > *
> > >
> >
> >
> >
> > --
> > *Satajanus Nig. Ltd
> >
> >
> > *
> >
> >
> > --
> > To unsubscribe from the list, just send an email to
> > lists at rebol.com with unsubscribe as the subject.
> >
>
> --
> Tim
> tim at johnsons-web.com or akwebsoft.com
> http://www.akwebsoft.com
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>
>
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*
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