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jgarber/gist:7452338

Created November 13, 2013 16:50
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One of my students just asked about the behavior below and I didn't have a good answer. Do you have an explanation?
Raw
gistfile1.rb
2.0.0p247 :001 > a = [1, 2]
=> [1, 2]
2.0.0p247 :002 > a[1]
=> 2
2.0.0p247 :003 > a[2]
=> nil
2.0.0p247 :004 > a[1,1]
=> [2]
2.0.0p247 :005 > a[2,1]
=> [] ## <- Why is this not nil?
2.0.0p247 :006 > a[3,1]
=> nil
@konata

konata commented Nov 13, 2013

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http://ruby-doc.org/core-2.0/Array.html#method-i-5B-5D
it says it's special case

@jgarber

jgarber commented Nov 13, 2013

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Yes, but that's all it says. Did you see an explanation?

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