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Quoth Peñá, Botp:
> Eric wrote:
> >    a3 = a1.select { |e| a2.include?(e) }
> >
> 
> compare:
>    a3 = a1.select { |e| e.in? a2}
> 
> the latter is more straightforward. the former expression rocks my brain 
from left to right.
> 
> Can we see light for #in? in ruby2? (just asking since december is near :) 
and i do not see it in mauricio's eigenclass site either)
> 
> kind regards -botp

Array#include?

  arr = [:sym, 'str'] # => [:sym, 'str']
  arr.include? :sym # => true

HTH,
-- 
Konrad Meyer <konrad / tylerc.org> http://konrad.sobertillnoon.com/

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