Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
consider a recursive solution:
my @flattened_array = flatten($nested_array_ref); sub flatten { my $array = shift; my @results = (); foreach my $element ( @$array ) { if( ref $element eq 'ARRAY' ) { push @results, flatten($element); } elsif( $element ) { push @results, $element; } } return @results; }

update: I investigated per rob_au's concerns with the following code using the above subroutine:

use Data::Dumper; use strict; my $nested_array_ref = [ '', [ 'a', [ 'b', 'c' ], '', 'd' ], 'value' ]; my @flattened_array = flatten($nested_array_ref); print Dumper(\@flattened_array);

and my output was this:

$VAR1 = [ 'a', 'b', 'c', 'd', 'value' ];

the example i gave explicitly passed an array_ref into the function to begin with, and @results is local to the subroutine, and does not get blown away during recursion.


In reply to Re: How to flatten an x-dimensional array? by AidanLee
in thread How to flatten an x-dimensional array? by Incognito

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

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

How do I use this?Last hourOther CB clients
Other Users?
Others surveying the Monastery: (10)
As of 2024-03-29 15:24 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found