method
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|(p1)
public
Set Union — Returns a new array by joining ary with other_ary, 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" ] | [ "c", "d", "a" ] #=> [ "a", "b", "c", "d" ] [ "c", "d", "a" ] | [ "a", "b", "c" ] #=> [ "c", "d", "a", "b" ]
See also Array#uniq.