[Jprogramming] Request for comments: multiple assignment

['Mike Day' via Programming]

Not multiple assignment,  but copula-related.

I've often wondered why J doesn't have the C family feature of assignments
such as
    t =: 1 2 3
   [t+=: 3
4 5 6

I don't know what it's called,  and I realise it's only an arguably 
attractive
feature, not an essential one, but would be useful,  especially when 
translating
(or plagiarising) to J from C-like code.

John Scholes et al managed to include it in Dyalog APL many years ago;  
it's
in his "dfns" (dynamic functions, I think) as well as their more 
conventional
APL functions and session operations. If I recall correctly,  John 
spells out rules
for passing values to variables of local scope within dfns using such 
operators.

Dyalog doesn't have constructs like t++,  though.

Thanks,
Mike

On 04/07/2017 06:40, HenryRich wrote:
> Here is a feature that I have wanted for a long time:
>
> http://code.jsoftware.com/wiki/System/Interpreter/Requests#Expanded_Multiple_Assignment 
>
>
> It attempts to solve the problem of moving verb arguments into 
> variable-names.  Allows defaults and multilevel arguments.  I will 
> implement this within a month or so, so get your comments in ASAP.
>
> Henry Rich
>
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