Divide with block : Set « Collections « Ruby

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Ruby » Collections » Set   Divide with block require 'set' s = %w[ant ape cow hen hog].to_set # A set of words s.divide {|x,y| x[0] == y[0]}      # Divide into subsets by first letter # => #<Set:{#<Set:{"hog", "hen"}>, #<Set:{"cow"}>, #<Set:{"ape", "ant"}>}>   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.  Flatten the subsets 29.  Add new method to set 30.  Partitioning or Classifying a Set 31.  Divide a set by value 32.  Divide a set by even and odd value 33.  Divide a set by its element's class 34.  Divide a set by absolute value 35.  Divide set into three sub sets 36.  Classify a set into three 37.  Convert a hash to set and divide 38.  Add set operation to Array 39.  Sort with block 40.  Set includes and membership

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