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Function definition: Difference between revisions
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The above subroutine can only be called with exactly two [http://perldoc.perl.org/perldata.html#Scalar-values scalar values] (two dollar signs in the signature) but those values may be not numbers or not even defined. The <code>@_</code> array is unpacked into <code>$a</code> and <code>$b</code> lexical variables, which are used later.
The arguments can be automatically unpacked into lexical variables using the
<lang perl>use experimental 'signatures';
sub multiply ($x, $y) {
return $x * $y;
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