Re: problem with foreach

You can't stack statement modifiers, thus

$b ++ if ( $_ eq "b" ) foreach @a ;
[download]

can't possibly work. Unfortunately. See perlsyn:

Any simple statement may optionally be followed by a SINGLE modifier, just before the terminating semicolon (or block ending).

Note the stress on "single". That's what it means.

This will work:

( $_ eq "b" ) and $b ++ foreach @a ;
[download]

as will this:

foreach(@a) {
    $b ++ if ( $_ eq "b" );
}
[download]

p.s. I think it's not good style to detach the ++ operator from the lvalue it's working on. So, use $b++ instead of $b ++.

And in the

statement if condition;
[download]

syntax, the parens around the condition are unnecessary.

Comment on Re: problem with foreach Select or Download Code

Replies are listed 'Best First'.
Re^2: problem with foreach by jeanluca (Deacon) on Jun 16, 2006 at 08:34 UTC
do you mean there is a difference between $b++ and $b ++ ?	[reply]
Re^3: problem with foreach by bart (Canon) on Jun 16, 2006 at 08:39 UTC
Apparently, there isn't. But I had to test it. I just have a very hard time reading and understanding it — while it's just such a small thing. Bring on the huge expressions! Your whitespace isn't improving readability — on the contrary.	[reply]
Re^3: problem with foreach by Jasper (Chaplain) on Jun 16, 2006 at 11:37 UTC
You should remember that there _is_ a difference betwixt ++$b and $b++, however. ++$b doesn't have the nuisance of making a copy of its original value to return before incrementing, and therefore it's slightly less efficient if, as in this case, you don't need to know what that value was.	[reply]