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Programming > Perl Beginners > Re: going throu...
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Re: going through array of hash, it only goes through limited amount

by krahnj@[EMAIL PROTECTED] (John W. Krahn) Apr 23, 2008 at 11:16 AM

Richard Lee wrote:
> 
> something is wrong with this..
> 
> say %yahoo's key contains the variable , X
> 
> I wanted to go through the @[EMAIL PROTECTED]
 which has array of hashes... to see if

> one of the value is equal to
> X and if it is, wanted to assign the key of the @[EMAIL PROTECTED]
 to $ex_var..
> 
> Tracing the program, it only goes through 6 lines of keys in @[EMAIL PROTECTED]
 
> (random keys) (it has 89 keys total).. what am i doing wrong?
> 
> 
> 
> 
>      while (my ($keys,$values) = each(%yahoo) ) {
>              no strict 'refs';
>              MF: for my $i (0 .. $#t_array) {
>                      for ( my($k,$v) = each(%{ $t_array[$i] } ) ) {

The for loop is not doing what you appear to think it is supposed to be 
doing:

$ perl -le'
my %hash = "A" .. "Z";
for my $c ( 1 .. 3 ) {
     my $i;
     for ( my ( $k, $v ) = each %hash ) {
         print "$c ", ++$i, qq[: \$_ = "$_"   \$k = "$k"   \$v = "$v"];
         }
     }
'
1 1: $_ = "S"   $k = "S"   $v = "T"
1 2: $_ = "T"   $k = "S"   $v = "T"
2 1: $_ = "A"   $k = "A"   $v = "B"
2 2: $_ = "B"   $k = "A"   $v = "B"
3 1: $_ = "O"   $k = "O"   $v = "P"
3 2: $_ = "P"   $k = "O"   $v = "P"


You need to use each() in a while loop instead.


>                          my $keys_b = qr/$keys/;
>                          if ( $v  =~ m/$keys_b/ ) {
>                              $ex_var = $k;
>                              last MF;
>                      }
>                   }
>              }


John
-- 
Perl isn't a toolbox, but a small machine shop where you
can special-order certain sorts of tools at low cost and
in short order.                            -- Larry Wall
 




 11 Posts in Topic:
wrote-only language?
peng.kyo@[EMAIL PROTECTED  2008-04-23 13:03:51 
Re: wrote-only language?
chas.owens@[EMAIL PROTECT  2008-04-23 12:46:41 
going through array of hash, it only goes through limited amount
rich.japh@[EMAIL PROTECTE  2008-04-23 13:23:50 
Re: going through array of hash, it only goes through limited am
krahnj@[EMAIL PROTECTED]   2008-04-23 11:16:39 
Re: going through array of hash, it only goes through limited am
rich.japh@[EMAIL PROTECTE  2008-04-23 14:55:31 
Re: going through array of hash, it only goes through limited am
rich.japh@[EMAIL PROTECTE  2008-04-23 15:04:45 
Re: going through array of hash, it only goes through limited am
rich.japh@[EMAIL PROTECTE  2008-04-23 21:21:06 
Re: going through array of hash, it only goes through limited am
rich.japh@[EMAIL PROTECTE  2008-04-23 21:37:41 
Re: wrote-only language?
rob.dixon@[EMAIL PROTECTE  2008-04-23 17:43:53 
Re: wrote-only language?
orasnita@[EMAIL PROTECTED  2008-04-23 20:27:45 
Re: wrote-only language?
Jenda@[EMAIL PROTECTED]   2008-04-24 00:50:49 

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tan12V112 Sun Jul 6 7:04:04 CDT 2008.