I'm humbly asking for explanation of basic perl knowledge.
What puzzles me is that I'm having a code like that:
my @lexlist = @_;
@lexlist = sort keys %lexicon if(!@lexlist);
which works very well. This is the beginning of a subroutine
and all I want is to have in lexlist either a list of
elements I gave as arguments to this routine or - if
none were given - to create this list from some hash.
My problem is, that me thinks the following should be
my @lexlist = @_ or sort keys %lexicon;
unfortunatedly this doesn't work at all and I have no clue
why. It seems, that @_ is always evaluated to a true value
even if it is empty. Why this exceptional behaviour?
I'm sure I'm missing something very very basic...
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
Outside of code tags, you may need to use entities for some characters:
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||