Re: Iterating over an hash while removing keys

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
[download]

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]

Comment on Re: Iterating over an hash while removing keys Select or Download Code

Replies are listed 'Best First'.
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]