Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical

Re^3: Options with optional values and condititions

by runrig (Abbot)
on Oct 02, 2012 at 18:50 UTC ( #996894=note: print w/replies, xml ) Need Help??

in reply to Re^2: Options with optional values and condititions
in thread Options with optional values and condititions

if ($foo) probably-unintentionally checks for truth...
It was intentional by me, though I don't know what the OP wants. From the docs:
Using a colon ":" instead of the equals sign indicates that the option value is optional. In this case, if no suitable value is supplied, string valued options get an empty string '' assigned, while numeric options are set to 0.

So yes, if you supply a value of "0" to a string option, you'll miss it. If you want to catch that situation you'll have to code for it. I often assume such strings are invalid in most practical situations.

  • Comment on Re^3: Options with optional values and condititions

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://996894]
[1nickt]: Corion Yes, once bitten, twice shy with experimental. If you use use experimental qw/ refaliasing declared_refs/; you can do my (\%x, \%y) = @_ when you like hashes but are given hashrefs :-)
[1nickt]: ^ 5.26 required for declared_refs

How do I use this? | Other CB clients
Other Users?
Others chilling in the Monastery: (6)
As of 2017-11-17 21:06 GMT
Find Nodes?
    Voting Booth?
    In order to be able to say "I know Perl", you must have:

    Results (272 votes). Check out past polls.