🚀 go-pugleaf

Scott Hawley wrote:
> 
> What to you think? Loops without using loops?
> 
> a loop:
> 
> for(i=0;i<10;i++)
> {
>   stuff
> }
> 
> Looping with out a loop
> 
> no_loop(0,10);
> 
> no_loop(int start, int end)
> {
>     if(start != end) {
>         stuff
>         no_loop(start+1,end);
>     }
> }
> 
> I haven't tested this but you get the idea.

In J I frequently use something like 

empty  keyra each vector

where vector contains number of elements which may or may not be 
referenced in the verb keyra or subsequently called verbs. Its size
is used as a counter.

vector could look like this:

vector=.i.111

Keyra could look like this:

keyra=: 3 : 0
try. runni ''
catch. empty''
end.
)

each makes the verb keyra be called as many times as there are elements
in vector. 

empty makes sure I do not get any display of any results.

each and empty are utilty verbs in J

runni is a verb called by keyra and is actually the one I want to 
call but if it breaks down somewhere I dont want the operation to
halt but to continue with the next element of vector.

I do not specify any start nor end


-- 
/Gosi , bjornhp@simi.is 
http://www2.simi.is/~gosi
http://www.jsoftware.com