I forgot to add:
Yesterday, in my question I was told that one way to do what I wnat is to do:
inl_z_ =: (cocurrent@] ".@] [)"1 0and then 'fname' inl 0{listwould return the
first name.Is there another way to do this? THis seems to need to change the
current locale, which is quite clumsy, possibly.
> From: [email protected]
> To: [email protected]
> Date: Wed, 4 Jun 2014 16:16:40 +0100
> Subject: [Jprogramming] More Object List Questions
>
> I hope I'm not spamming the forum with my questions.
> I am still getting my head around OOP in J.
> My class:
>
> coclass 'Account'
>
> create =: verb define
> balance =: 0
> fname =: ''
> lname =: ''
> )
> It's just a dummy 'Account' class with balance, first name and last name.
> I want to create several objects in a list:
>
> list =. 5 $ < 'Account'
>
> list
>
> ┌───────┬───────┬───────┬───────┬───────┐│Account│Account│Account│Account│Account│└───────┴───────┴───────┴───────┴───────┘
>
> So I have my list of 5 Accounts. Now I want to be able to access their
> fields, functions by indexing the list.
> e.g. in Java if I have an array of Accounts
> Account[] accounts = new Account[5];
> I can access the fields from the array index:
> for(int i = 0; i<5; i++){
> accounts[i].fname = "No name given";
> }
> In J,
> I tried the following:
> create__(1{list)
> |value error: create__
> | create__(1{list)
> I tried to call the create function of the 2nd Account (index 1) of th elist.
> It seems I can't append 1{list to create__.
> Next I thought about making a function to do the work for me:
> NB. function to return y's fname...
> func =: verb define acct =. y name =: fname__acct name
> )
> The above function assumes y is an instance of Account.
> Alas, func 1{list doesn't work.
> However if I do:
> acct =: 1{list
> func acct
> This will return the fname.
> But I have to explicitly define acct, which is not particularly terse. Is
> there a way to call functions from the list of objects?
>
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