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


duerst (Martin Dürst) wrote:
> Instead of this proposal, what about adding some/most/all of the Array methods to Enumerator?

It is not easy to define behavior of Enumerator#[].
For example:

  File.open(path){|f|
    ls = f.lines
    p lines[0]   #=> Prints first line
    p lines[0]   #=> Prints nil, if #[] is equivalent to #to_a[pos]
  }
----------------------------------------
Feature #6670: str.chars.last should be possible
https://bugs.ruby-lang.org/issues/6670#change-34063

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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