From: "yhara (Yutaka HARA)" <redmine@...>
Date: 2012-11-27T12:18:03+09:00
Subject: [ruby-core:50191] [ruby-trunk - Bug #7440] IO#lines etc. should return Array


Issue #7440 has been updated by yhara (Yutaka HARA).


Eregon (Benoit Daloze) wrote:
> Strongly agreed. It could also increase a lot the memory usage (while on String we anyway already have the whole String in memory so it is less of a concern).
> 
>     File.open('/usr/share/dict/words').lines.each_with_object(Hash.new(0)) { |word, count| count[word[0].downcase] += 1 }

In that case you can use IO#each_line, which still returns Enumerator.

     File.open('/usr/share/dict/words').each_line.with_object(Hash.new(0)) { |word, count| count[word[0].downcase] += 1 }

But in other words, we need to replace uses of IO#lines to IO#each_line, or our existing Ruby program may have performance problem with 2.0.0...

# Ticket #6670 is reopened. Please continue discussion there http://bugs.ruby-lang.org/issues/6670
----------------------------------------
Bug #7440: IO#lines etc. should return Array
https://bugs.ruby-lang.org/issues/7440#change-34002

Author: yhara (Yutaka HARA)
Status: Open
Priority: Normal
Assignee: yhara (Yutaka HARA)
Category: core
Target version: 2.0.0
ruby -v: ruby 2.0.0dev (2012-11-26 trunk 36708) [x86_64-darwin12.2.1] 


String#bytes, #chars, #codepints and #lines are changed to return Array in #6670.

For consistent behavior, following methods should return Array too:

* ARGF.lines, chars, bytes, codepoints
* IO#lines, chars, bytes, codepoints
* StringIO#lines, chars, bytes, codepoints
* Zlib::GzipReader#lines, bytes

Please let me know if there are more.


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