ruby send和ruby public_send方法有什么区别？

Question

我很想知道send和之间的区别public_send.例如:

class Klass
  def hello(*args)
    "Hello " + args.join(' ')
  end
end

k = Klass.new
k.send :hello, "gentle", "readers" #=> "Hello gentle readers"
k.public_send :hello, "gentle", "readers" #=> "Hello gentle readers"

有人可以解释一下这个区别吗？

Answer 1

http://apidock.com/ruby/Object/public_send

与send不同,public_send仅调用公共方法.

例:

class Klass
  private
  def private_method
    puts "Hello"
  end
end

k = Klass.new
k.send(:private_method)
=> "Hello"
k.public_send(:private_method)
=> `public_send': private method `private_method' called for 
    #<Klass:0x007f5fd7159a80> (NoMethodError)