Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things
 
PerlMonks  

How to check similarity of two hash tables

( #157719=categorized question: print w/ replies, xml ) Need Help??
Contributed by Rajiv on Apr 09, 2002 at 13:44 UTC
Q&A  > hashes


Description:

Perl Monks, Please Suggest: How can i find whether two hash tables have same and equal number of keys.

Answer: How to check similarity of two hash tables
contributed by RMGir

Of course, the obligatory one-liner (ok, one-expression) version:

my $areEqual = (keys %hash1 == keys %hash2) && 0 == grep {!exists $hash2{$_}} keys %hash1;
Answer: How to check similarity of two hash tables
contributed by RMGir

They're equal if, as you say, they have the same number of keys AND all the keys in one are in the other.

my $areEqual=1; if(keys %hash1 == keys %hash2) { foreach my $key(keys %hash1) { if(!exists $hash2{$key}) { $areEqual=0; last; } } } if($areEqual) { print "ARE "; } else { print "ARE NOT "; } print "equal\n";

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 scrutinizing the Monastery: (11)
    As of 2014-07-23 04:14 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite superfluous repetitious redundant duplicative phrase is:









      Results (133 votes), past polls