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Feature #12752
closed
Unpacking a value from a binary requires additional '.first'
Status:
Closed
Assignee:
-
Target version:
-
Description
When I parsed a binary protocol (msgpack) by String#unpack, there are many similar expressions, like below:
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:
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) # ... 
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