Three more ways for a fallback action: 
($op_map{$op_choice}||$defaultaction)->(@args);
($op_map{$op_choice}||$op_map{defaultaction})->(@args);
($op_map{$op_choice}||sub {die "'$op_choice' is invalid"})->(@args);

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In reply to Re^2: calling a function as a value from a hash by Beechbone
in thread calling a function as a value from a hash by shobhit

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