merge ruby

gistfile1.rb

def merge(a,b)
  merged_array = []
  j = 0
  k = 0
  while j < a.size || k < b.size
   if a[j] && b[k] && a[j] <= b[k]
    merged_array << a[j]
    j+= 1
   elsif b[k]
     merged_array << b[k]
     k += 1
   else
      merged_array << a[j]
      j += 1
   end
  end
  return merged_array
end

p merge([1,3,5],[2,4,6,8,9])