On Wednesday 05 May 2010, John W. Krahn wrote:
> > If I could explain this further for Perl beginners:
> > With that foreach statement, it reads the file first and creates an
> > array with each line as elements and that array is being looped so the
> > overhead is higher, whereas with that while statement, loop is
> > processed whilst the file is being read and hence it's more
> > appropriate. So while would be a better choice, more so if the file
> > size is higher and there's a scope of closing the file before it's
> > read completely.
> >
> > That's what I understood. Please correct me if there was anything
> > incorrect with that.
>
> Yes, foreach reads the file into a list, not an array.
>
> perldoc -q "What is the difference between a list and an array"
Thanks for the explanation John. Could you give one or two real time examples
where you used a list (instead of an array) except in loops such as: for ('a',
'b', 'c', 'd')? I wonder if I'm underusing lists in my Perl programs.
--
Regards,
Akhthar Parvez K
http://Tips.SysAdminGUIDE.COM
UNIX is basically a simple operating system, but you have to be a genius to
understand the simplicity - Dennie Richie
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