[om] Manipulating Structured Data

David Carlisle davidc at nag.co.uk
Tue Nov 19 10:58:55 CET 2002

  Lets say I wish to 
  sum up the (P.quantity) attribute of the list members.  Any suggestion how I 
  could deal with this situation?

use map


to generate the list of things you wantt o sum, then apply sum to that


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