Re: Spotting an empty array as argument

There is a conceptual hole in Perl's arguments parsing, and choroba is spot on with his explanation.

The only flexible workaround I found using prototypes is a (;&) , which will mean you need to put your parameters in a block.

Not sure if you are willing to pay that price of surrounding your parameters in curlies, but a block can hold any number and type of list elements.

  DB<32> sub my_say (;&) { $_[0] ? say $_[0]->() : say $_ }

  DB<33> @a=('a1'..'a3'); $a="A",$b="B"; $_=666

  DB<34> my_say
666

  DB<35> my_say {@a}
a1a2a3

  DB<36> my_say {@a,$a}
a1a2a3A

  DB<37> my_say {$a,1..3}
A123

  DB<38>
[download]

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

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Re^2: Spotting an empty array as argument by Chuma (Scribe) on Mar 25, 2021 at 22:09 UTC
That's probably too cumbersome in this case, considering the only advantage I'm striving for is being able to write "say;" instead of "say $_;". But nice to know anyway!	[reply]