[Templates] creating lists

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I want to collect several lists of numbers from a loop. The type of 
statements I have in mind to do this go something like:

   listname = 'an_actual_listname' ;
   a_number = 42 ;
   my_hash.$listname.push(a_number)

This doesn't work unless I prime the lists outside the loop with 
statements like:

   my_hash.an_actual_listname = [ ]

I'd like to avoid that if I can, so that I can use the existence or not 
of the hash keys as an indication of whether any of that class of 
numbers occurred, instead of iterating checking list sizes.

Is there a neat way to do this?

Thanks, Dave


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