From: "yhara (Yutaka HARA)" <redmine@...>
Date: 2012-11-28T01:32:55+09:00
Subject: [ruby-core:50231] [ruby-trunk - Feature #6670] str.chars.last should be possible


Issue #6670 has been updated by yhara (Yutaka HARA).


trans (Thomas Sawyer) wrote:
> If I understand correctly, this is going to break a lot of code?

For String, the impact will be limited.

* String#lines returns Array, which has most of the methods defined in Enumerator.

* Exceptions are #next, #peek, #with_index, etc.
  If you have a code like `str.lines.with_index', you need to change it to `str.each_line.with_index'.

* When you have a huge string, `str.lines' will become slower and consume more memory.
  I think this is a rare case because we usually avoid `File.read(path_to_huge_file)'.
  Even when you really need huge_str.lines to return Enumerator, you can use huge_str.each_line instead.

For IO/StringIO/ARGF/GzipReader, I'd like to +1 for showing deprecation warning in 2.0.0.
----------------------------------------
Feature #6670: str.chars.last should be possible
https://bugs.ruby-lang.org/issues/6670#change-34050

Author: yhara (Yutaka HARA)
Status: Assigned
Priority: Normal
Assignee: yhara (Yutaka HARA)
Category: core
Target version: 2.0.0


=begin
Since str.chars returns an Enumerator, we need explicit to_a for some operations:

  str.chars.to_a.last
  str.chars.to_a[1,3]

But often I forget that and write:

  str.chars.last
  str.chars[1,3]

Besides that, I feel it is hard to explain why to_a is needed here when I'm writing
artilcles for Ruby beginners. 

Simplest way to achieve this is to make String#chars (also #lines, #bytes and #codepoints)
return an Array. Since arrays have most of the methods defined in Enumerator, this will 
not be a big change. For programs like str.chars.next, you can use each_char instead.
=end



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