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Postings from September 2023
On 2023-09-05 23:37, Ivan Vorontsov wrote:
> [...]
> f($x, $y = 1, $z = 2) # $y is optional parameter
> f($x, $y //= 1, $z = 2) # $y is mandatory parameter
> f($x, $y //= 1, $z ) # $y is mandatory parameter
> f($x, $y //= 1 ) # $y is mandatory parameter
>
> Consider this example:
>
> f($v, $w //= 42, $x, $y //= 1, $z = 2)
>
> Here $v, $w, $x, $y are mandatory, $z is optional. But function can be
> called with less arguments than number of mandatory parameters because
> of $y.
Mandatory is a strict condition,
so if-or-when it gets called with less arguments than defined as the
minimum,
then that is an error, which is best caught at compile-time ("if") already.
A run-time ("when") check is still needed, as f(@v) could turn out to be
a violation.
-- Ruud
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