Re: hash count

scalar grep defined($_), values %hash

If you don't want to grep for defined values, delete the values instead of setting them to undef, then you can the output of scalar %hash.

See perldata on what exactly the scalar value of a hash is.

Update: fixed syntax error. Sorry for not writing the update notice in the first place.

Comment on Re: hash count Select or Download Code

Replies are listed 'Best First'.
Re^2: hash count by kyle (Abbot) on Mar 25, 2009 at 14:51 UTC
I usually use "`scalar keys %hash`" to find how many pairs are in a `%hash`. `scalar grep defined($_) values %hash` [download] I think that should be: `scalar grep defined, values %hash;` [download] or `scalar grep { defined } values %hash;` [download]	[reply] [d/l] [select]
Re^3: hash count by AnomalousMonk (Archbishop) on Mar 25, 2009 at 15:22 UTC
`scalar grep defined($_) values %hash`I think that should be: ... It could be as you have written it, but I think moritz may have been considering the relative inexperience of the OPer by passing the parameter explicitly rather than implicitly. Also, the code fragment was `scalar grep defined($_), values %hash` (comma present after the `defined($_)` built-in call) in moritz's original reply (unless moritz has been updating replies without noting the fact – unlikely!).	[reply] [d/l] [select]
Re^4: hash count by moritz (Cardinal) on Mar 25, 2009 at 15:24 UTC
(unless moritz has been updating replies without noting the fact – unlikely!). I did, mea culpa. (I sometimes do that when the node is still very new and there are no replies and it's a small change. But if it causes confusion, I try to clarify it).	[reply]
Re^3: hash count by moritz (Cardinal) on Mar 25, 2009 at 15:15 UTC
Yes, I forgot the comma after the `defined`, and updated my post. Thanks to ikegami for noting it.	[reply] [d/l]