Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Maybe it's just that I was a math major, or got too close to those whacky Haskell nuts, but map has always seemed a very natural metaphor for me. (It's the natural extension of a function on a space A to the space An)

However, this (map is natural instead of foreach) is only true when the expression inside the map isn't itself accumulating side-effects; e.g. the following useage of map doesn't seem natural:

my $i=0; map {$keywordhash{$_}=(++$i);} @keywords;
However, this useage seems quite natural:
%keywordhash = map {$_ => 1} @keywords;
I guess you could also distinguish these two cases by noting that one calls map in void context whereas the other does not; while that's true, I think I'd still prefer
do {$keywordhash{$_}=(++$i);} for @keywords;
over:
%keywordhash = map { $_ => ++$i } @keywords;
Even though I like map, because I'm not completely comfortable with the idea of depending on a certain execution order for map, even though I know it has one. When I'm thinking in a linear, this-gets-executed-then-this mode, map rarely makes sense. map does however make sense as a higher-order function, and when I'm thinking like that it's quite natural.

(Of course, all style niceties get completely discarded inside JAPHs)

--
@/=map{[/./g]}qw/.h_nJ Xapou cets krht ele_ r_ra/; map{y/X_/\n /;print}map{pop@$_}@/for@/

In reply to Re^2: Things I Don't Use in Perl by fizbin
in thread Things I Don't Use in Perl by Ovid

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 wandering the Monastery: (8)
    As of 2015-07-07 05:46 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 (87 votes), past polls