Ruby - 为类对象

Question

是否可以通过在Ruby中使用反射来调用给定类对象的所有无参数方法？

Answer 1

def call_paramater_less_methods(instance)
   instance.class.instance_methods(false).each do |m|
     instance.public_send(m) if instance.method(m).arity.zero?
   end
end

class C
  def a()  puts "a says hi"   end
  def b()  puts "b says ho"   end
  def c(s) puts "c says #{s}" end
end

call_paramater_less_methods(C.new)
  # b says ho
  # a says hi

任选地，

instance.public_send(m) if instance.method(m).arity.zero?

可以替换为

instance.method(m).call if instance.method(m).arity.zero?