From: knu@... Date: 2016-12-01T10:25:23+00:00 Subject: [ruby-core:78453] [Ruby trunk Feature#12752] Unpacking a value from a binary requires additional '.first' Issue #12752 has been updated by Akinori MUSHA. With a qualifier or multiple directives given, would it raise an ArgumentError or just go ahead with the process and only return the first value? ---------------------------------------- Feature #12752: Unpacking a value from a binary requires additional '.first' https://bugs.ruby-lang.org/issues/12752#change-61824 * Author: Satoshi TAGOMORI * Status: Open * Priority: Normal * Assignee: ---------------------------------------- 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) # ... ``` -- https://bugs.ruby-lang.org/ Unsubscribe: