From: Brian Candler <b.candler@...>
Date: 2011-04-26T19:08:41+09:00
Subject: Re: Using the spaceship operator

RichardOnRails wrote in post #994401:
> While I'm still playing with delegation,  I've taken "ownership" of a
> couple of the ideas previously offered, most notably "sort_by" and:
> class Meta < Array
>   def <=>(other)
>     self[1] <=> other[1]
>   end
> end
>
> a = []
> [ [:A,12], [:B,30], [:C,4]  ]. each { |element| a <<
> Meta.new(element) }
> p a.sort

And a slightly tidier way is to use 'map' (aliased as 'collect') which 
iterates and accumulates the output array in one go:

a = [ [:A,12], [:B,30], [:C,4] ].map { |element| Meta.new(element) }
p a.sort

Regards,

Brian.

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