「初始化程序=新配置」是做什麼的？

Question

initializer = new configuration是做什麼用的？

def self.run(configuration = Configuration.new) 
    yield configuration if block_given? 
    initializer = new configuration 
    initializer. 
    initializer 
end 

Answer 1

代碼的情況下大概是這樣的：

class MyClass 
    def self.run 
    .... 

所以自我是MyClass的。寫作new是self.new的快捷方式，意思是MyClass.new，它只是創建一個新類的實例。

Answer 2

讓我們一起來看看這些路線。

# It is a definition of a class method which takes one argument 
# with a default value.  
def self.run(configuration = Configuration.new) 
    # It passes the argument to a block if one was given. 
    yield configuration if block_given? 
    # It calls method `new` passing the `configuration` as 
    # an argument. The returned value is saved in the local 
    # variable. 
    initializer = new configuration 
    # Two following lines are a single expression: a call 
    # to method `initializer` of the object pointed to by the 
    # variable `initializer`, i.e. 
    # 
    # initializer.send :initializer 
    # 
    # No idea why one would break this expression into two lines. 
    # The value returned from the call to `initializer` becomes 
    # the return value of the analysed method. 
    initializer. 
    initializer 
end