Feature #12752
Updated by shyouhei (Shyouhei Urabe) over 7 years ago
When I parsed a binary protocol (msgpack) by `String#unpack`, there are many similar expressions, like below: ```ruby ``` str = io.read(1) length = str.unpack('C').first case length when 4 data = io.read(4).unpack('N').first # ... ``` I know that `unpack` returns "1 or more" values, but I think there are too many cases to return just one object. Creating Array objects for return values requires additional cost to create Array object, and calling `.first`. I'm happy if I can write the code above like this: ```ruby ``` str = io.read(1) length = str.unpack('C', 0) # index, or str.unpack('C', index: 0) case length when 4 data = io.read(4).unpack('N', 0) # ... ```