Question

I have two pieces of code. The first one is what I wanted. BUt why is it the second one is giving me 1’s and 0’s (is my english correct, or is it “1s and 0s”) and not “johnchrismandy”.

foreach (@data) {
    print ;
}
//output
john
chris
mandy

foreach  (@data) {
    print chomp ;
}
//output
110

UPDATE::
Thank you guys, I understand it more now.
But I don't understand the last part of the doc.

=>
You can actually chomp anything that's an lvalue, including an assignment:
chomp($cwd = pwd);

Answer 1

This is documented behaviour: “It returns the total number of characters removed from all its arguments.” You want

for (@data) {
   chomp;
   print "$_\n";
}

Note that $_ is aliased to the element of @data, so @data is getting modified too. If you don’t want that to happen.

for (@data) {
   my $item = $_;
   chomp($item);
   print "$item\n";
}

---

About the last line of the docs:

my $item = $_; returns $item as an lvalue (a value suitable for the left-hand side of an assignment). As such,

my $item = $_;
chomp($item);

can be written as

chomp( my $item = $_ );