Chops off the last character of a string and returns the character chopped. It is much more efficient than
s/.$//s because it neither scans nor copies the string. If VARIABLE is omitted, chops
$_. If VARIABLE is a hash, it chops the hash's values, but not its keys.
You can actually chop anything that's an lvalue, including an assignment.
If you chop a list, each element is chopped. Only the value of the last
chop is returned.
chop returns the last character. To return all but the last character, use
substr($string, 0, -1).
See also "chomp".