From: Gavin Sinclair <gsinclair@...>
Date: 2012-07-07T12:32:18+09:00
Subject: Strange behaviour when selecting range of elements from an array?

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(1)  a = [:x, :y, :z]    => [:x, :y, :z]
(2)  a[2..-1]            => [:z]
(3)  a[3..-1]            => []
(4)  a[4..-1]            => nil
(5)  a[5..-1]            => nil
(6)  a[6..-1]            => nil

I consider line (3) to be the odd one out here.  Given a[3] returns nil,
why shouldn't a[3..-1] also return nil?

Gavin

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<div><font face=3D"courier new, monospace">(1) =A0a =3D [:x, :y, :z] =A0 =
=A0=3D&gt; [:x, :y, :z]</font></div><div><font face=3D"courier new, monospa=
ce">(2) =A0a[2..-1] =A0 =A0 =A0 =A0 =A0 =A0=3D&gt; [:z]</font></div><div><f=
ont face=3D"courier new, monospace">(3) =A0a[3..-1] =A0 =A0 =A0 =A0 =A0 =A0=
</font><span style=3D"font-family:&#39;courier new&#39;,monospace">=3D&gt; =
[]</span></div>

<div><div><font face=3D"courier new, monospace">(4) =A0a[4..-1] =A0 =A0 =A0=
 =A0 =A0 =A0</font><span style=3D"font-family:&#39;courier new&#39;,monospa=
ce">=3D&gt; nil</span></div></div><div><div><font face=3D"courier new, mono=
space">(5) =A0a[5..-1] =A0 =A0 =A0 =A0 =A0 =A0</font><span style=3D"font-fa=
mily:&#39;courier new&#39;,monospace">=3D&gt; nil</span></div>

</div><div><div><font face=3D"courier new, monospace">(6) =A0a[6..-1] =A0 =
=A0 =A0 =A0 =A0 =A0</font><span style=3D"font-family:&#39;courier new&#39;,=
monospace">=3D&gt; nil</span></div></div><div><span style=3D"font-family:&#=
39;courier new&#39;,monospace"><br>

</span></div><div>I consider line (3) to be the odd one out here. =A0Given =
a[3] returns nil, why shouldn&#39;t a[3..-1] also return nil?</div><div><br=
></div><div>Gavin</div>

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