Add set operation to Array : Set « Collections « Ruby






  1. Ruby
  2. Collections
  3. Set

Add set operation to Array


require 'set'


class Array
  def classify
    
    h = {}
    each do |i|
      x = yield(i)
      (h[x] ||= self.class.new) << i
    end
    h
  end

  def divide(&block)
    Set.new(classify(&block).values)
  end
end

p [1,1,2,6,6,7,101].divide { |x| x % 2 }
# => #<Set: {[2, 6, 6], [1, 1, 7, 101]}>








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31.Partitioning or Classifying a Set
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33.Divide a set by even and odd value
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