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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