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[REBOL] Re: Help

From: emekamicro:gmai:l at: 10-Sep-2010 11:36

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 <tim-johnsons-web.com> wrote:
> * Emeka <emekamicro-gmail.com> [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 <emekamicro-gmail.com> 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 > -- > To unsubscribe from the list, just send an email to > lists at rebol.com with unsubscribe as the subject. >
-- *Satajanus Nig. Ltd *