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If you add or delete a hash's elements while iterating over it, entries may be skipped or duplicated--so don't do that

perlfaq4#What happens if I add or remove keys from a hash while iterating over it?

(contributed by brian d foy)

The easy answer is "Don't do that!"

If you iterate through the hash with each(), you can delete the key most recently returned without worrying about it. If you delete or add other keys, the iterator may skip or double up on them since perl may rearrange the hash table. See the entry for each() in perlfunc.

In reply to Re: Stepping through a hash while modifiying its content by Anonymous Monk
in thread Stepping through a hash while modifiying its content by Gorgarian

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