Re: Iterating over an hash while removing keys

by choroba (Cardinal)

on Feb 06, 2020 at 16:55 UTC ( #11112500=note: print w/replies, xml )

Need Help??

You don't have to call scalar. Using a void context resets the iterator without even checking the keys at all.

- scalar(keys %$hash); # Force reset
+ keys %$hash;         # Force reset
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Update: Documented in keys:

> In particular, calling "keys" in void context resets the iterator with no other overhead.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

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Re^2: Iterating over an hash while removing keys by Eily (Monsignor) on Feb 06, 2020 at 16:57 UTC
That was actually my first version, and I forgot to ask about the behaviour of keys in void context (it was really likely that it didn't expand the list of keys needlessly, but better safe than sorry :) ). Thanks!	[reply]

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