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Postings from February 2011
In 5.10, these both returned true:
%ENV ~~ "TERM"
"TERM" ~~ %ENV
but by 5.11, the first of those fails because commutabilty
of the smart-match operator was rescinded. While it's true
that you can do either of these:
"TERM" ~~ %ENV
%ENV ~~ ["TERM"]
instead of the now non-working:
%ENV ~~ "TERM"
It also means you can't do this anymore:
given(%Opts) {
when ( "fullpaths" ) { }
when ( "shortpatsh" ) { }
when ( "nopaths" ) { }
when ( "dospaths" ) { }
}
but rather must do this:
given(%Opts) {
when (["fullpaths"]) { }
when (["shortpatsh"]) { }
when (["nopaths"]) { }
when (["dospaths"]) { }
}
Is that accurate?
And what does (HASH ~~ SCALAR) mean? The table in perlop^H^Hsyn
doesn't even mention it:
$a $b Type of Match Implied Matching Code
====== ===== ===================== =============
Hash CodeRef sub truth for each key[1] !grep { !$b->($_) } keys %$a
Hash Hash hash keys identical (every key is found in both hashes)
Hash Array hash keys intersection grep { exists $a->{$_} } @$b
Hash Regex hash key grep grep /$b/, keys %$a
--tom
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