From: Andrew Wagner <wagner.andrew@...>
Date: 2010-10-11T05:59:48+09:00
Subject: More readable array querying

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All,
I've been playing with some code to make querying an array more readable.
Basically, it lets you write one of the following:

puts [1,2,3].first that {|x| x.even? }
puts [1,2,3].first that is :even

instead of this:

puts [1,2,3].find {|x| x.even? }

The code is below. I'm curious whether you'd find it useful, interesting,
worthwhile, etc., and if there are improvements you can think of. Either
way, it was a fun little exercise. I love the flexibility I get from writing
in ruby!

module Kernel
  def that proc=nil, &block
    p = proc.nil? ? block : proc
    lambda { |x| x.instance_eval &p }
  end

  def is message
    lambda { |x| x.send "#{message}?".to_sym }
  end
end

class Array
  alias :old_first first

  def first func=nil
    return old_first if func.nil?
    each do |x|
      return x if func.call x
    end
    nil
  end
end

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