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

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I like nuance's idea (above). I now store undef as the value when a key is missing from one hash. See nuance's description above for an explanation of the "return" values.

Here's some punctuation for you:

(This is a short, concentrated way to do it - only 4 lines)

# Keys 7 and 8 are unique, keys 2,4 and 6 have different values my %R = (1=>1, 2=>2, 3=>3, 4=>4, 5=>5, 6=>6, 7=>7); my %S = (1=>1, 2=>'b', 3=>3, 4=>'d', 5=>5, 6=>'f', 8=>8); # 1) Keys in %R which are not in %S # 2) Keys in %S which are not in %R # 3) Keys in both which have different values my %Diffs = ((map(($_ => [$R{$_}, undef]), grep {not exists $S{$_}} k +eys %R)), (map(($_ => [undef, $S{$_}]), grep {not exists $R{$_}} k +eys %S)), (map(($_ => [$R{$_}, $S{$_}]), grep {exists $S{$_} and $R{$_} ne $S{$_}} keys %R)) +); # Print out what we found for (sort keys %Diffs){ print $_, ': ', join(', ', map(defined $_ ? $_ : 'undef', @{$Diffs{$ +_}})), "\n"; }
A couple points to note:
  • if your values are numeric, change the 'ne' in the third Diffs section
  • we use an anonymous array ref to store the values in %Diffs, so remember to dereference it when you use %Diffs



In reply to Re: diff of two hashes. by Russ
in thread diff of two hashes. by ChuckularOne

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, 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
  • 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.
  • Log In?

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

    How do I use this? | Other CB clients
    Other Users?
    Others meditating upon the Monastery: (4)
    As of 2019-07-21 12:43 GMT
    Find Nodes?
      Voting Booth?
      If you were the first to set foot on the Moon, what would be your epigram?

      Results (8 votes). Check out past polls.