ary.insert(index, obj...) รข ary
Instance Public methods
Inserts the given values before the element with the given
index.
Negative indices count backwards from the end of the array, where
-1 is the last element.
a = %w{ a b c d }
a.insert(2, 99) #=> ["a", "b", 99, "c", "d"]
a.insert(-2, 1, 2, 3) #=> ["a", "b", 99, "c", 1, 2, 3, "d"]
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