The rap against "while True:" loops
Tue Oct 13 03:16:51 CEST 2009
kj <no.email at please.post> writes:
> I use "while True"-loops often, and intend to continue doing this
> "while True", but I'm curious to know: how widespread is the
> injunction against such loops? Has it reached the status of "best
E. W. Dijkstra used to advocate that every loop have exactly one entry
point and exactly one exit point, i.e. no multiple break statements.
This is probably a misstatement, but I believe that the purpose was to
be able to specify a precondition at the loop entrance and a
postcondition at the exit, and be able to verify the conditions more
straightforwardly than if there were multiple exit points. But, that
doesn't specifically seem to speak against "while True:". For
example, Ada has a loop construct where the test and break is in the
middle of the loop.
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