Re: Fastest way to compare multiple variables?

[runrig]

'Fastest' depends on whether or not they ARE 'all equal' :)

#!/usr/bin/perl

my $a = 2;
my $b = 2;
my @arr = qw( 2 2 2 );

if (all_equal_ints($a, $b, @arr)) {
 print "They're all equal!\n"
} else {
 print "They're not all equal!\n";
}

sub all_equal_ints {
 my $first = shift;
 for (@_) {
  return 0 unless $first == $_;
 }
 return 1;
}

[zeidrik]

Try this:

#!/usr/local/bin/perl -w
use strict;
my @list=("abcd123","abcd143","abcd123","abcd123");

$_=join("",@list);
s/$list[0]//g;
print "not equal\n" if ($_);

[owendelong]

The problem with that is that the code will produce an incorrect result in the case:

my @list={"a","aaaa","aa","aaaaaaaa","a"};

In the above (admittedly pathological) case, it would report all equal when this is not true.

[topher]

A comment correcting a code snippet that was posted 12 years ago.

I love Perlmonks. ;-)