comment on

This does all the straightforward tests, and warns and returns undef on stuff it can't reliably compare (like code refs). Would probably be better to use UNIVERSAL::isa rather than ref.

sub deep_eq {
    my ($a, $b) = @_;
    if (not defined $a)        { return not defined $b }
    elsif (not defined $b)     { return 0 }
    elsif (not ref $a)         { $a eq $b }
    elsif ($a eq $b)           { return 1 }
    elsif (ref $a ne ref $b)   { return 0 }
    elsif (ref $a eq 'SCALAR') { $$a eq $$b }
    elsif (ref $a eq 'ARRAY')  {
        if (@$a == @$b) {
            for (0..$#$a) {
                my $rval;
                return $rval unless ($rval = deep_eq($a->[$_], $b->[$_
+]));
            }
            return 1;
        }
        else { return 0 }
    }
    elsif (ref $a eq 'HASH')   {
        if (keys %$a == keys %$b) {
            for (keys %$a) {
                my $rval;
                return $rval unless ($rval = deep_eq($a->{$_}, $b->{$_
+}));
            }
            return 1;
        }
        else { return 0 }
    }
    elsif (ref $a eq ref $b)   { warn 'Cannot test '.(ref $a)."\n"; un
+def }
    else                       { return 0 }
}
[download]

In reply to Re: How do I test the deep equality of two hash tables? by Roy Johnson
in thread How do I test the deep equality of two hash tables? by acser

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.


good chemistry is complicated, and a little bit messy -LW
	PerlMonks