Ruby 什么是;初始值设定项=新配置;做
Ruby 什么是;初始值设定项=新配置;做,ruby,Ruby,initializer=newconfiguration做什么 def self.run(configuration = Configuration.new) yield configuration if block_given? initializer = new configuration initializer. initializer end 该代码的上下文可能类似于: class MyClass def self.run .... 所以赛尔夫是我的班级。编写
initializer=newconfiguration
做什么
def self.run(configuration = Configuration.new)
yield configuration if block_given?
initializer = new configuration
initializer.
initializer
end
该代码的上下文可能类似于:
class MyClass
def self.run
....
所以赛尔夫是我的班级。编写
new
是self.new
的快捷方式,意思是MyClass.new
,它只是创建类的一个新实例。让我们逐步浏览这些行
# 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
+1
请听我解释!谢谢你如此详细的答复。:)谢谢!最后我意识到了这个用法。