Re^2: do until loop breaks before meeting the condition

ehm ... he's using goto as loop control, last, next and redo are not much different.

Than you don't print the $msg before first run like he did.

Considering "cleanest" and "DRYest" flow control , I'd rather try this

> perl

$max_length=5;

OUTER: {
    print "Input max is $max_length!!!\n";
    while (1) {

        chomp( $input = <STDIN> );

        last OUTER
          if lc( $input )    eq "end";
        redo OUTER
          if length( $input ) > $max_length;

        print "- $input is OK\n";

    }  
}

__END__
Input max is 5!!!
1
- 1 is OK
12345
- 12345 is OK
123456
Input max is 5!!!
123
- 123 is OK
end
>
[download]

YMMV! :)

update

please note that the more verbose

OUTER: 
  while(1) {
     ...
[download]

works equally well and might be less surprising for some maintainers. :)

Cheers Rolf

(addicted to the Perl Programming Language)

Comment on Re^2: do until loop breaks before meeting the condition Select or Download Code

Replies are listed 'Best First'.
Re^3: do until loop breaks before meeting the condition by thanos1983 (Parson) on Jun 08, 2014 at 18:50 UTC
To: Lanx, Thanks, I was not even aware of: `last, next and redo`. Hmmm based on second look your solution looks simple and I ques better than mine. I think I will follow it. Again thank you for your time and all this information that you shared. Seeking for Perl wisdom...on the process...not there...yet!	[reply] [d/l]
Re^3: do until loop breaks before meeting the condition by Laurent_R (Canon) on Jun 09, 2014 at 06:22 UTC
Well, I am not an anti-goto fanatic, the comment on gotos was just one out of 3 comments. I still think it is much better to use regular loop control statements (last, next, etc.), and it is most of the time best to avoid `goto`s altogether (except for the special `goto &name` construct).	[reply] [d/l] [select]