Arrays in Rev

[Frank D. Engel, Jr.]

As far as records (C's struct types), there are at least two ways to do 
this:

Mathod 1. Arrays

Since array keys can be strings, you can convert something like this:

VAR myRec : RECORD x, y : INTEGER END;

BEGIN
     x := 5;
     y := 7
END;


into something like this:

put 5 into myRec["x"]
put 7 into myRec["y"]

(Transcript's arrays are *really* cool...)


Method 2.  Objects

You can also use custom properties on objects in place of fields on 
records.  So create a button called "myRec", then:

set the x of button "myRec" to 5
set the y of button "myRec" to 7


On Dec 10, 2004, at 1:15 AM, Jan Schenkel wrote:

> --- Gordon <gwalias-rev at yahoo.com> wrote:
>> Dear Revolutionaries
>>
>> Can an element of a rev array be another array?
>>
>> If not, is there any way to achieve the effect of
>> nesting arrays - OR if not, is there some way to
>> create new container types (like the structures and
>> unions typical in C and Pascal). Basically - how do
>> I
>> create complex organized containers (objects) to
>> hold
>> my data?
>>
>> Best
>>
>> Gordon
>>
>
> Hi Gordon,
>
> As Xavier pointed out, there are no nested arrays in
> Revolution. In addition to his suggestion to use the
> "split" and "combine" commands when needed, I'd like
> to point at the other two options : crafting array
> keys to simulate the behaviour, and using XML trees as
> a way to hierarchically store information into nodes.
>
> 1. Array keys
> Revolution arrays are actually associative arrays,
> which means that the keys can be any string, and you
> can use separators as much as you like. Example :
> --
>   put "01/01/2003" into \
>       tCustomerData["1,history,23,date"]
>   put tCustomerData["78,contacts,3,phone"] into \
>       tPhoneNumber
> --
>
> 2. XML trees
> If you build your tree correctly, you can get the
> content of your data using calls like :
> --
>   put "data/customers[1]/history[23]/date" into \
>       tNode
>   revPutIntoXMLNode tXMLTree,tNode,"01/01/2003"
>   put "data/customers[78]/contacts[3]/phone" into \
>       tNode
>   put revXMLNodeContents(tXMLTree,tNode) into \
>       tPhoneNumber
> --
> For more information about XML and how Rev supports
> it, make sure to download the tutorial by Sarah
> Reichelt, available from the Runtime Revolution
> website at :
> <http://support.runrev.com/resources/xml.php>
>
> Hope this helped,
>
> Jan Schenkel.
>
> =====
> "As we grow older, we grow both wiser and more foolish at the same 
> time."  (La Rochefoucauld)
>
>
> 		
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>
-----------------------------------------------------------
Frank D. Engel, Jr.  <fde101 at fjrhome.net>

$ ln -s /usr/share/kjvbible /usr/manual
$ true | cat /usr/manual | grep "John 3:16"
John 3:16 For God so loved the world, that he gave his only begotten 
Son, that whosoever believeth in him should not perish, but have 
everlasting life.
$



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