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The stupid question is the question not asked

How can I know how many entries are in a hash?

by faq_monk (Initiate)
on Oct 08, 1999 at 00:20 UTC ( #625=perlfaq nodetype: print w/ replies, xml ) Need Help??

Current Perl documentation can be found at

Here is our local, out-dated (pre-5.6) version:

If you mean how many keys, then all you have to do is take the scalar sense of the keys() function:

    $num_keys = scalar keys %hash;

In void context it just resets the iterator, which is faster for tied hashes.

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