From: Mike Stok <mike@...>
Date: 2002-09-13T09:21:37+09:00
Subject: Re: Multi-level sort idiom?

In article <3D812169.58D388D8@managesoft.com>, Clifford Heath wrote:
> I was wrong. Interesting behaviour - nice but confusing - I would have
> thought that what with operators being mostly implemented as methods,
> the result of nonzero? would be returned instead of the result of
> a[0]<=>b[0]. Is there a definitive statement of which operators/methods
> modify the "last expression executed"?

The result of nonzero? does get returned, effectively nonzero?
transforms any number except 0 to itself, and 0 is transformed to a
false value, nil.

  0.nonzero?      => nil
  1.5.nonzero?    => 1.5
  (-1.5).nonzero? => -1.5

so

  (a <=> b).nonzero?

will be the result of a <=> b, except in the case when it's 0.

Hope this helps,

Mike

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