hash count

vinoth.ree has asked for the wisdom of the Perl Monks concerning the following question:

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Re: hash count by moritz (Cardinal) on Mar 25, 2009 at 14:39 UTC
`scalar grep defined($_), values %hash` If you don't want to grep for defined values, delete the values instead of setting them to undef, then you can the output of `scalar %hash`. See perldata on what exactly the scalar value of a hash is. Update: fixed syntax error. Sorry for not writing the update notice in the first place.	[reply] [d/l] [select]
Re^2: hash count by kyle (Abbot) on Mar 25, 2009 at 14:51 UTC
I usually use "`scalar keys %hash`" to find how many pairs are in a `%hash`. `scalar grep defined($_) 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
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]
Re: hash count by Corion (Patriarch) on Mar 25, 2009 at 14:39 UTC
There is this fascinating concept of programming. It involves writing code to solve a problem. I think this concept is applicable here.	[reply]