I read the post from beech++. Another thing to consider is this slight re-write: 
#!/usr/bin/perl
use strict;
use warnings;
use YAML::Syck;

my $hash = {
            'k1'=>'v1',
            'k2'=>'v2',
            'k3'=>'v3',
           };
# Part 1 - works fine
while ( my ($k, $v) = each(%$hash) )
{
    print "$k, $v\n";
}

# Part 3 - use foreach loop instead of while(each)

foreach my $k (keys %$hash)
{
    print "$k, $hash->{$k}\n";
    DumpFile("test.yml", $hash);
}

__END__
stdout prints:

k3, v3
k2, v2
k1, v1
k3, v3
k2, v2
k1, v1

test.yml file has:
--- 
k1: v1
k2: v2
k3: v3

[download]
This works without "hanging". I think that foreach (keys %$hash){} builds a list that is then iterated over and therefore what DumpFile does with the internal hash iterator doesn't matter. Of course in any event, DumpFile should be moved outside of the loop - no need to create it over and over again.

In reply to Re: Action on each key/value pair in a hash by Marshall
in thread Action on each key/value pair in a hash by luxs

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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, details, 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, summary, 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.