iterating over two arrays

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

I have an array that holds information with which I'd like to apply in a search of another array. @array = ($username, $pass); @array1 = ($user, $info, $info1,$info2); I'd like to know the most efficient way of correlating the info.

foreach my $line(@array) {
  foreach (@array1) {
    if ($username eq $user){
      print "$line\n";
    }
  }
}
[download]

That does not seem to me to be good - can anybody show me how to do it?

Thanks

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Re: iterating over two arrays by Mugatu (Monk) on Mar 04, 2005 at 17:24 UTC
You will probably want to load one of the array's values into a hash, keyed on the field you want to correlate them with. It looks like you want to match on username, so that would be your hash key. Here's an abstract example: `my @foo = ( [ 1, 'foo' ], [ 2, 'bar' ], [ 3, 'baz' ], ); my %bar = ( 1 => [ 'a', 'b', 'c' ], 2 => [ 'd', 'e', 'f' ], 3 => [ 'g', 'h', 'i' ], ); for (@foo) { my ($num, $label) = @{ $_ }; print "$label: ", @{ $bar{$num} }, "\n"; }` [download] Here, the number is used to correlate the values.	[reply] [d/l]
Re^2: iterating over two arrays by Anonymous Monk on Mar 04, 2005 at 23:05 UTC
Mugatu I want to marry you and have your babies (metaphorically speaking, I'm afraid!] That's exactly what I'm looking for Thanks	[reply]
Re: iterating over two arrays by sh1tn (Priest) on Mar 04, 2005 at 16:18 UTC
You may want to see To Pattern Match or not to Pattern Match.	[reply]
Re: iterating over two arrays by saintmike (Vicar) on Mar 04, 2005 at 16:28 UTC
See perlfaq4: How do I compute the difference of two arrays? How do I compute the intersection of two arrays? (use this site until perldoc.com or perldoc:// gets fixed).	[reply]
Re: iterating over two arrays (mapcar) by tye (Sage) on Mar 04, 2005 at 17:53 UTC
Algorithm::Loops contains several flavors of MapCar, which lets you iterate through several arrays at once (update:) in parallel, which isn't what was asked for. Sorry. - tye	[reply]