Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

BrowserUk is right, don't use a module to do that if you can do it with one line of code! Grep receives an array a LIST and returns an array a LIST. The returned array will be shorter, but the elements will be added in the order in which they are encountered in the other array.

Imagine you do this:

@array1 = @array2;
The elements in @array1 will be in the same order has in @array2, right?

Now do this:

foreach $element ( @array2 ) { push( @array1, $element ); }
The elements in @array1 will still be in the same order has in @array2, don't you think?

And if you do this:

foreach $element ( @array2 ) { if ( not $seen{$element} ++ ) { push( @array1, $element ); } }
Guess what? The elements will still be in the same order and I just explicitly did what grep do in one line.

There are no stupid questions, but there are a lot of inquisitive idiots.

In reply to Re^5: Order in which grep/map receive elements by greengaroo
in thread Order in which grep/map receive elements by abufct

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 contemplating the Monastery: (13)
    As of 2014-09-18 18:18 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

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











      Results (120 votes), past polls