From: "knu (Akinori MUSHA)" Date: 2012-11-27T20:14:31+09:00 Subject: [ruby-core:50219] [ruby-trunk - Feature #6670] str.chars.last should be possible Issue #6670 has been updated by knu (Akinori MUSHA). It may be an idea to simply obsolete IO#{lines,chars,codepoints,bytes} for now. First of all, line wise operation is known to be popular and we've already got #readlines since a long time ago. So, there is no need for a new IO#lines that returns an array unlike String. For chars, codepoints and bytes, there is no known need for turning a whole file or stream into an on-memory array because we haven't offered such methods to date. That may be because character or byte wise operation on a stream is typically done using a seek pointer as it reads lazily. If this should be the case, we don't have an urge need for a new IO#chars, #codepoints or #bytes. However, we, including matz, confirmed in this issue that a method that does not return an array having a name in the plural form is not intuitive because most Enumerator method have a name consisting of each_ + singular noun, and lines etc. are breaking that convention. So, what about simply obsoleting IO#{lines,chars,codepoints,bytes} in the current shape? We can re-add them later in another shape perhaps after we introduce an indexable enumerator (lazy array) that would satisfy everyone who might take both performance and intuitiveness seriously. ---------------------------------------- Feature #6670: str.chars.last should be possible https://bugs.ruby-lang.org/issues/6670#change-34030 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 -- http://bugs.ruby-lang.org/