5, 6, 7, 8, 9] copy = numbers[0...numbers.length] # [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] middle = copy[3..6] # [3, 4, 5, 6] numbers[3..6] = [-3, -4, -5, -6] # [0, 1, 2, -3, -4, -5, -6, 7, 8, 9] numbers[7..] # [ 7, 8, 9 ] numbers[..4] # [ 0, 1, 2, -3, -4 ] numbers[7..-2] # [ 7, 8 ] numbers[-3..-1] # [ 7, 8, 9 ]