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Mon Sep 21 09:13:15 EDT 2015

Pattern: maps over lists that change contents

context:
- server with a couple of connections
- connections come and go

problem:
- take a snapshot "map", e.g. list, + apply function
  need to do this in 1 step, as list might change between ops


possible solution:
- parallel map
- failure during evaluation means no result is returned
- device appearing after initial list means no result is returned
- how do you know there was a failure?  use exceptions



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