Someone with more knowledge of internals will have to confirm, but I bet that the assignment is being processed before the conditional. As a result, the evaluation goes from left to right, thus making the last assignment (the one in the "false" portion) be the one that sticks.

The ternary operator gets its power from being able to embed it as part of a larger statment, not just in using it as an obscure if statement. Here's a better way to write that code:

$param2 = @_ ? "Shift" : shift;

The ternary operator will return the value passed from whichever argument was run. You want to avoid side-effects in these arguments.

"There is no shame in being self-taught, only in not trying to learn in the first place." -- Atrus, Myst: The Book of D'ni.


In reply to Re: Confused by Perl ternary operator by hardburn
in thread Confused by Perl ternary operator by newest_newbie

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, 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, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.