From: Alexey Muranov <muranov@...>
Date: 2011-10-30T07:24:50+09:00
Subject: [ruby-core:40515] [ruby-trunk - Feature #4541] Inconsistent Array.slice()


Issue #4541 has been updated by Alexey Muranov.


To me it would seem natural if
[:a,:b,:c][4..1] # => []
and
[:a,:b,:c][1..4] # => [:b,:c,nil,nil]

- Alexey
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Feature #4541: Inconsistent Array.slice()
http://redmine.ruby-lang.org/issues/4541

Author: Marcin Pietraszek
Status: Assigned
Priority: Normal
Assignee: Yukihiro Matsumoto
Category: core
Target version: 1.9.x


=begin
Array slice/[] method is a bit inconsistent. Is it just poorly documented "feature" or a bug? In API doc I can't find this behaviour mentioned as a "special case".

 def test_array_slice
    array = ['a', 'b', 'c']
    assert_equal nil, array[3]
    assert_eaual nil, array[4]
 
    assert_eaual [], array[3, 0] #
    assert_equal nil, array[4, 0] # [] expected (or both nils in array[3, 0] and array[4, 0])
 
    assert_equal ['c'], array[2..2]
    assert_equal [], array[3..3] #
    assert_equal nil, array[4..4] # [] expected (or both nils in array[3..3] and array[4..4])
 end

Same behaviour can be reproduced on ruby 1.8.7 (2010-12-23 patchlevel 330) [x86_64-linux].
=end



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