Ruby/Array/Array Addition

x = [1, 2, 3]
y = ["a", "b", "c"]
z = x + y
puts z.inspect

yrs = [1999]
yrs << 2000 # => [1999, 2000]
# You can chain these, too:
yrs << 2001 << 2002 << 2003 # => [1999, 2000, 2001, 2002, 2003]

q1 = %w[ January February March ]
q2 = %w[ April May June ]
q3 = %w[ July August September ]
q4 = %w[ October November December ]
half1 = q1 + q2
half2 = q3 + q4
yr = half1 + half2