def method_with_varargs(a, b = true, *c)
  puts
  puts a.inspect
  puts b.inspect
  puts c.inspect
end

method_with_varargs(1)
method_with_varargs(1, 2)
method_with_varargs(1, 2, 3)
method_with_varargs(1, 2, 3, 4)

1
true
[]

1
2
[]

1
2
[3]

1
2
[3, 4]