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Re: if (defined %hash) deprecated

by Rudolf (Pilgrim)
on Oct 15, 2012 at 16:13 UTC ( #999112=note: print w/replies, xml ) Need Help??


in reply to if (defined %hash) deprecated

This is definetly one of those things that I aswell have wondered about. I've been forced to search the hash to see if any items where inside (or check it's buckets by assigning a scalar). Knowing that (%hash) acts like it should is a nice tidbit! thanks for the post.

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Re^2: if (defined %hash) deprecated
by AnomalousMonk (Canon) on Oct 15, 2012 at 19:02 UTC
Re^2: if (defined %hash) deprecated
by Ralesk (Pilgrim) on Oct 16, 2012 at 08:12 UTC

    By assigning to a scalar or by checking truthiness, you’re forcing a scalar context, so it can be expected to behave the same – that is, return a falsy value (0) when empty and non-falsy when not (and all the bucket counts are non-falsy). Same goes for arrays which report number of elements when not wantarray.

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[james28909]: ill be back with a solution eventually
[stevieb]: it's a reminder to re-inforce it :P
[atcroft]: james28909: That particular questions was a bit of trick, actually (depending on the country you are in). More interesting is, if you are trying to subtract from an epoch time, for instance, you might have to consider when/if DST occurs for a location,
[atcroft]: because you may have to adjust the number of seconds you change from an epoch from 86400 (not to mention leap seconds)....
[atcroft]: james28909: Although if your program is using a database, you might be able to "pass the buck" to the database and ask it to do the date change for you....

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