... I often use a fat comma to separate the "how-to-operate" and the "what-to-operate-on" arguments.

My favorite personal "off-label" usage of  => is in an OO-code statement like
    return bless $objectref => $class;
for what I imagine to be its self-documenting qualities: "bless object reference into class."

In reply to Re^4: Print something when key does not exist by AnomalousMonk
in thread Print something when key does not exist by jaypal

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