Hello Oleg,
As advised I am going through the labs again.
For now, can you explain what you have suggested below?
a) what does '(x) := y' do?
b) why have you added this into the z locale? Is it to make it a global?
c) what does 'set__x/y' do? set_z_ is defined as a dyad. I donot see how the
arguments are being passed to set_z_ here.
Thanks,
Yuva
On 12/22/06, Oleg Kobchenko <[EMAIL PROTECTED]> wrote:
Here's what you need:
set_z_=: 4 : '(x)=: y'
add_z_=: 4 : 'set__x/y'
obj=: cocreate''
names__obj''
obj add 'name';'MyName'
MyName
names__obj''
name
name__obj
MyName
--- Yuvaraj Athur Raghuvir <[EMAIL PROTECTED]> wrote:
> Hello,
>
> Continuing on my experiment with the DSL I imagine...
>
> Client Code:
> obj =: bo 'customer' NB. create is now called bo
> obj add ('name';'MyName')
>
> =========================================
> This should result in :
> 0) An instance obj of type customer. (I used Bill's version here)
> 1) an attribute added to the class of obj
> 2) the attribute instantiated in the specific instance obj.
>
> I tried the following (based on the above recommendations...) for the
add
> verb -
>
> add =: 4 : 0
> attr =. 0{::y
> class =. ; {. @ copath x
> s =. attr,'_',class,'_'
> NB. s =: attr,'_',class,'_ =:', 1{::,y
> ". s
> s =. attr,'__x',' =:', 1{::,y
> ". s
> )
>
> As you can see, I am creating strings and executing them.
>
> Q1: Is there a simpler way to inject names into locales?
>
> Then, I look at the names I have so far created:
>
> conames ''
> 0 1 2 base customer j jgl2
>
> jijs jprint jproject jregex jscriptdoc jview y
>
> z
>
> names_customer_ ''
> names__obj ''
> COCREATOR name
> name__obj
> +------+
> |MyName|
> +------+
>
> Q2: Why is the names_customer_ empty? Is it because of lazy evaluation
of J?
> By this I mean that since the attribute is not assigned a value, the
> namespace of 'customer' does not record the attribute called 'name'.
>
> Q3: Later, I would like to apply reflection techniques to look into the
> objects I have created of the various type (here instances of locatives)
-
> for this I assumed that I need to introduce the attribute in the class
> and assign value to it in the object instance. But, with the issue
mentioned
> in Q2, I donot know how to proceed.
>
> Thanks for any pointers here,
>
> Yuva
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
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