[#78633] ruby/spec needs help from CRuby committers — Benoit Daloze <eregontp@...>
Currently, ruby/spec is maintained mostly by individuals and enjoys the
13 messages
2016/12/13
[#78963] Re: ruby/spec needs help from CRuby committers
— Urabe Shyouhei <shyouhei@...>
2017/01/04
I did ask attendees of last developer meeting to join this
[#78642] Re: ruby/spec needs help from CRuby committers
— Eric Wong <normalperson@...>
2016/12/14
Benoit Daloze <[email protected]> wrote:
[ruby-core:78452] [Ruby trunk Feature#12752] Unpacking a value from a binary requires additional '.first'
From:
matz@...
Date:
2016-12-01 09:52:06 UTC
List:
ruby-core #78452
Issue #12752 has been updated by Yukihiro Matsumoto.
Go ahead.
Matz.
----------------------------------------
Feature #12752: Unpacking a value from a binary requires additional '.first'
https://bugs.ruby-lang.org/issues/12752#change-61823
* 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)
# ...
```
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