First, why what you have there doesn't work.

The arguments of ~~ are necessarily evaluated in scalar context. ($x ~~ @a is just a shorthand for $x ~~ \@a.) That means that ~~ ("x", "y", "z") is equivalent to ~~ "z", as you were advised by warnings.

Secondly, getting the behaviour you do want.

Well, you want the SCALAR ~~ ARRAY behaviour, so you'll need an reference to an array, so you'll need an array. "x" ~~ ["x", "y", "z"] and "x" ~~ any("x", "y", "z") are the most concise means of achieving that with ~~. (any provided by Smart::Match).

If you don't mind moving away from ~~, you could also use grep "x" eq $_, ("x", "y", "z").

In reply to Re: ~~ and list literal by ikegami
in thread ~~ and list literal by Anonymous Monk

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.