Add set operation to Array : Set « Collections « Ruby

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Ruby » Collections » 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]}>   Related examples in the same category 1.  Create set with Set.new 2.  Create set with constant values 3.  Is it in a set 4.  Is it a subset 5.  Set length, size and empty? 6.  The intersection is the set of values that appear in both 7.  The union is the set of values that appear in either 8.  a-b: is the elements of a except for those also in b 9.  a^b is the set of values that appear in one set but not both: (a|b)-(a&b) 10.  Add element to a set 11.  merge a range to a set 12.  Remove elements from a set 13.  Set subtraction 14.  Delete elements from a set with block 15.  Reject elements from a set 16.  Do an in-place intersection like this: 17.  Replace a set 18.  Clear a set 19.  Is it empty 20.  Each loop 21.  Map elements in a set 22.  Collect in place 23.  Convert set to array 24.  Inspect a set 25.  Compare two sets 26.  Classify set elements as even or odd 27.  Divide set 28.  Divide with block 29.  Flatten the subsets 30.  Add new method to set 31.  Partitioning or Classifying a Set 32.  Divide a set by value 33.  Divide a set by even and odd value 34.  Divide a set by its element's class 35.  Divide a set by absolute value 36.  Divide set into three sub sets 37.  Classify a set into three 38.  Convert a hash to set and divide 39.  Sort with block 40.  Set includes and membership

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