return function - return return value - Perl ABC - Perl Installation, Perl Tutorial, Many Examples

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return function - return return value

You can use the return function to return the return value of a subroutine.

return Return value

When actually using it, write return in the subroutine.

sub sum {
  my ($num1, $num2) = @_;

  my $total = $num1 + $num2;
  
  # Return of return value
  return $total;
}

The return value can be obtained by calling the subroutine.

my $return_value = sum (2, 4);

Empty return

An empty return has a special syntax, list context, an empty list, scalar context, undef is returned.

# Empty return
return

Empty returns are a frequently used syntax in Perl.

Multiple return values

In Perl, using list or array will return multiple values. I can.

# Return list
return(3, 5);

# Return array
my @nums = (3, 5);
return @nums;

You can return multiple values this way, but I personally prefer to return an array reference rather than an array.

What is the difference between return and exit?

While return is used to return to the caller from within a subroutine, exit terminates the program itself. Be sure to use return when you finish the subroutine. It is rare to explicitly describe exit.

Learn more about how to use return

For details on how to create a subroutine, see the following article. It also explains in detail how to use return.

How to create a subroutine - argument, return value

Perl ABC