Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
The comma is still constructing a list, that simply has nowhere to go. Since the list is constructed left to right, the right-most element ends up being assigned to $a.

UPDATE:

It would appear that I'm incorrect in asserting that the thing on the right side of an equation that looks like this:

$a = (1, 2, 3, 4);

could be construed as being a list. And even more incorrect in saying that it is in scalar context.

While I don't understand how it isn't a list (it's contained in (), it has commas, and it represents multiple values), I do understand that whatever term we can use to describe the Rvalue entity, we cannot say that it is a list in scalar context. This, to my understanding after reading merlyn's discussion threads is because a list is a list is a list, and scalars are scalars are scalars. The only possibly accurate description for the above code example, that I can come up with having read merlyn's words, are that it is the list is passing its rightmost element through the assignment operator ( = ) which is, itself, in scalar context. The entity on the right still looks like a list to me, but it is apparently accurate to assert that the comma operator knows whether the items it is affecting are being passed to a scalar or to an array. My prior supposition was that the assignment operator ( = ) was the one who understood things like context.

I am nevertheless curious to see the internal representation of a statement such as the one above; not the 'perl -MO=Deparse' one, but still lower level, so that I can better understand the nature of such a statement. I can accept at face value the descriptions I've received from the Gods and Saints, but it is still appropriate to understand the internal character of ones' faith.

Dave

"If I had my life to do over again, I'd be a plumber." -- Albert Einstein


In reply to Re: Re: dot '.', comma ',' operators "oops" & "huh?" by davido
in thread dot '.', comma ',' operators "oops" & "huh?" by chunlou

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!
  • 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, 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
  • 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.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others having an uproarious good time at the Monastery: (5)
    As of 2015-07-08 02:40 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (93 votes), past polls