a-b: is the elements of a except for those also in b : Set « Collections « Ruby

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Ruby » Collections » Set   a-b: is the elements of a except for those also in b require 'set' primes = Set[2, 3, 5, 7] odds = Set[1, 3, 5, 7, 9] p primes-odds               # => #<Set: {2}> p odds-primes               # => #<Set: {1, 9}> p primes.difference(odds)   # A named method alias   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 set of values that appear in one set but not both: (a|b)-(a&b) 9.  Add element to a set 10.  merge a range to a set 11.  Remove elements from a set 12.  Set subtraction 13.  Delete elements from a set with block 14.  Reject elements from a set 15.  Do an in-place intersection like this: 16.  Replace a set 17.  Clear a set 18.  Is it empty 19.  Each loop 20.  Map elements in a set 21.  Collect in place 22.  Convert set to array 23.  Inspect a set 24.  Compare two sets 25.  Classify set elements as even or odd 26.  Divide set 27.  Divide with block 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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