Arrays: Methods

def reverse_plus_one(a)
  a << a.first
  a.reverse
end

p reverse_plus_one([1,2,3,4])


def pluses_everywhere(a)
  a.join("+")
end

p pluses_everywhere([1,2,3])

def array_quantity_plus_one(a)
    a.length + 1
end

p array_quantity_plus_one([1,2,3,4])