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Programming-Idioms

# 313 Map equality
Set b to true if the maps m and n have the same key/value entries, false otherwise.
New implementation

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Other implementations 
#include <map>
b = m == n;
import "maps"
b := maps.Equal(m, n)
boolean b = m.equals(n);
use Data::Compare;
$b = Compare( \%hash1, \%hash2 );
sub hcmp_numeric {
    my ($h, $g) = @_;

    my $hc = keys %$h;
    my $gc = keys %$g;

    return 0 unless $hc == $gc;
    return 0 unless $hc == grep { exists $g->{$_} } keys %$h;
    die 'non-scalar value detected' 
        if 0 < grep { ref $h->{$_} or ref $g->{$_} } keys %$h;
    return 0 unless $hc == grep { $h->{$_} == $g->{$_} } keys %$h;
    return 1;
}

b = m == n
b = m == n

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