From: Yukihiro Matsumoto <matz@...>
Date: 2012-02-21T02:29:04+09:00
Subject: [ruby-core:42769] [ruby-trunk - Bug #6053] Enumerator#rewind goes to beginning instead of decrementing one step.


Issue #6053 has been updated by Yukihiro Matsumoto.


It is a bug in documentation.  #rewind method rewinds the sequence to the beginning.

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Bug #6053: Enumerator#rewind goes to beginning instead of decrementing one step.
https://bugs.ruby-lang.org/issues/6053

Author: Chris Maddox
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 1.9.3
ruby -v: ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.3.0]


From the ruby docs:
    rewind ��� e
    Rewinds the enumeration sequence by one step.

In practice, however, it fully rewinds (either change documentation or have it do what it says. Going back one step is nice though):
irb(main):001:0> a = [1,2,3,4]
=> [1, 2, 3, 4]
irb(main):002:0> b = a.to_enum
=> #<Enumerator: [1, 2, 3, 4]:each>
irb(main):007:0> b.next
=> 1
irb(main):008:0> b.next
=> 2
irb(main):009:0> b.next
=> 3
irb(main):010:0> b.rewind
=> #<Enumerator: [1, 2, 3, 4]:each>
irb(main):011:0> b.next
=> 1



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