method

union

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union(*args) public

Set Union — Returns a new array by joining other_arys with self, excluding any duplicates and preserving the order from the given arrays.

It compares elements using their #hash and #eql? methods for efficiency.

[ "a", "b", "c" ].union( [ "c", "d", "a" ] )    #=> [ "a", "b", "c", "d" ]
[ "a" ].union( ["e", "b"], ["a", "c", "b"] )    #=> [ "a", "e", "b", "c" ]
[ "a" ].union #=> [ "a" ]

See also Array#|.

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