Hello Leon,
Monday, November 26, 2001, 12:15:59 AM, Leon wrote:
L> ----- Original Message -----
L> From: "Jenda Krynicky" <[EMAIL PROTECTED]>
L> To: <[EMAIL PROTECTED]>
L> Sent: Monday, November 26, 2001 4:44 AM
L> Subject: Re: @_
>> When you cann a function all the parameters you gave it end up in
>> @_. You can (and usualy do) copy them then into some lexical
>> variables to give them meaningfull names. You don't have to
>> though.
---->> If for example <---- you wanted to write a function that sums two
L> I like your style, in fact I think everybody should follow Jenda's style of
L> giving an example after an explanation ; an example paints a thousand words.
>> numbers you can write it either as
>> sub add {
>> my ($a, $b) = @_;
>> return $a + $b;
>> }
L> On the above, so what is @_?
L> @_ = ?
if i have code like:
$result = add( 2, 3 );
then in the code
sub add {
my ($a, $b) = @_;
return $a + $b;
}
@_ is set to the list (2, 3) just after the "sub add {" line
there's nothing really special about @_, it's the same as any other
array, eg:
@foo = (1, 2, 3);
isn't special, @_ is just an array who's name is "_", think of the _
like the letter "a" and it might look more comprehensible.
the only special part comes when we're calling a subroutine, where @_
is used to pass the variables into our subroutine.
we could say:
my @foo = (1,2,3);
my ($value1, $value2, $value3) = @foo;
and now $value1 == 1, $value2 == 2 and $value3 == 3. so it's the same
when we use @_ at the start of a function.
my ($a, $b) = @_;
does that make it any clearer?
--
Best regards,
Daniel mailto:[EMAIL PROTECTED]
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