什麼是紅寶石的區別發送和紅寶石public_send方法？

Question

我很好奇，想知道有什麼區別send和public_send之間。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" 

有人能解釋一下這個區別嗎？

Answer 1

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

與發送，public_send只調用公共方法。

例子：

class Klass 
    private 
    def m 
    puts "Hello" 
    end 
end 

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