On 19/11/17 13:57, hw wrote:
> without being able to use feature 'signatures', how do I verify
> that parameters passed to a function have been passed to it by
> the caller?
If you're dealing with positional parameters[1] (and not with named
ones) you can check for the size of @_ inside your function, that is,
you can check for the quantity of parameters given by the caller.
sub one {
$num_of_params = scalar @_;
print "$num_of_params\n";
}
one('str1'); # prints '1'; there's just one parameter
one('str2', undef); # prints '2'; the second parameter is undef,
# but the undef counts and it prints '2'
[1] Positional parameters would be as in sub_one('John', 'Zimbabwe');
and named parameters as in sub_two({ name => 'John', country =>
'Zimbabwe' });
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