I grepped it for the forbidden information that put my life in jeopardy a few days ago:

Binary //
A binary // operator is the defaulting operator. That is:

$a // $b
[download]

is short for:

defined($a) ?? $a :: $b         # [note:   this is the new ?:   -- bla
+kem]
[download]

except that the left side is evaluated only once. It will work on arrays and hashes as well as scalars. It also has a corresponding assignment operator, which only does the assignment if the left side is undefined:

$pi //= 3;
[download]

That's actually quite cool... currently when people use $a ||= b they often times really mean $a = defined ($a) ? $a : $b and now we'll have an easy way to do it..

//= gets a ++ in my book
[download]

-Blake

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