Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

How do I reverse a nested array?

( #33872=categorized question: print w/ replies, xml ) Need Help??
Contributed by Anonymous Monk on Sep 25, 2000 at 02:46 UTC
Q&A  > Data Structures


Description:

I am trying to reverse an array:
my @ary = (1,2,[a,b,[],[3,4,[6]],c],45); my @rev = reverse map [ reverse @$_ ], @ary;
But my output is: ([],[c,[[6],4,3],[],b,a,[],[]) How do I fix this?

Answer: How do I reverse a nested array?
contributed by extremely

sub rev_arr { my $ar = shift; ref $ar eq 'ARRAY' ? [ map rev_arr($_), reverse @$ar ] : $_ }

Please (register and) log in if you wish to add an answer



  • 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 perusing the Monastery: (8)
    As of 2014-09-18 11:23 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

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











      Results (112 votes), past polls