Dear Masters,
Given 4 distinct hashes with only one key-value, how can we find the maximum value, efficiently? Yes, the values of these hashes will be differrent in different running. 
my $hash_w = { w => 100 };
my $hash_x = { x => 200 };
my $hash_y = {};   # no value, but in other cases it can have one
my $hash_z = { z => 300 };

[download]
To return simply 
300 # from z

[download]
What I could think of is: 
my $w = values %$hash_w; 
my $x = values %$hash_x; 
my $y = values %$hash_y; 
my $z = values %$hash_z; 

my @all,
push @all, $w,$x,$y,$z;

my $max_val = (sort @all)[0];

[download]
But it is terribly inefficient, and not elegant. Is there a better way to do it?

---
neversaint and everlastingly indebted.......

In reply to Getting Max Value from Different Hashes by neversaint

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.