Re: printing a hash

[James Edward Gray II]

On Wednesday, June 11, 2003, at 10:33  PM, Stuart White wrote:

Well, I got the out put that I wanted.   the use
Data::Dumper; call really helped with my debugging,
thanks for the tip.  I understand what's going on
except for the printing and the foreach loops, can
someone break that down for me?  Also, any other
resources on foreach loops?  Thanks in advance, -stu
foreach is pretty simple.  It's just a way to iterate over a list of 
things, dealing with them one at a time.  Here's a few simple examples:

foreach my $number (1, 2, 3, 4, 5) {
        # in here we work on $number which will hold 1 then 2 then 3...
        print "$number.\n";
} # $number goes out of scope here
my $average = 0;        # declare outside loop to keep a running total
for my $number (1, 2, 3, 4, 5) {        # foreach can also be spelled for
        $average += $number;
}
$average /= 5;  # getting an average of 3
my @letters = qw(a b c d);
foreach (@letters) {	# if no variable is given, $_ is used
	tr/a-z/A-Z/;		# a lot of operations default to $_, like transliterate
	print "$_\n";
}
print "@letters\n";	# foreach aliases variables, so @letters was 
changed!

#foreach can also be used as a statement modifier
print foreach 'A'..'Z'; # print also defaults to $_
All of this is basic Perl, so just about any beginning resource is 
going to have plenty of material here.  Learning Perl is a popular 
first choice in the book department.

James

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