Beefy Boxes and Bandwidth Generously Provided by pair Networks
Welcome to the Monastery
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
merlyn,
It just happens that if a map is used in a scalar context, it returns the number of items it would have created had it been used as a list. But it just as easily could return the day of the year instead (although not quite as useful).

Perl 5 uses documentation to explain the implementation so saying "it is documented to return the number of elements in scalar context so it can't just as easily return the day of year instead" doesn't hold much water. Fortunately, Perl 6 is intended to have a complete specification allowing for any number of implementations. This has nothing to do with the issue I wanted to make though.

Your wording to me implies that map doesn't actually create the elements it counts. The docs say "In scalar context, returns the total number of elements so generated." which implies to me they are created. I know that there could be an optimization not to actually build up the return list such as happens when map is called in a void context with recent versions. If indeed it is as you say, a doc patch should be submitted to clarify.

Cheers - L~R


In reply to Re^3: map return to array reference by Limbic~Region
in thread map return to array reference by silent11

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
  • Outside of code tags, you may need to use entities for some characters:
            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 musing on the Monastery: (13)
    As of 2014-09-19 09:02 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      How do you remember the number of days in each month?











      Results (133 votes), past polls