::(双冒号)在Ruby中是什么意思? [英] What does :: (double colon) mean in Ruby?
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问题描述
::
在Ruby中是什么意思?例如. Foo::Bar
.
What does ::
mean in Ruby? E.g. Foo::Bar
.
推荐答案
从镐头:
在方法调用中显式指定接收方时,可以使用句点(
.
)或两个冒号(::
)将它与方法名称分隔.如果方法名称以大写字母开头,则这两种形式之间唯一的区别发生.在这种情况下,除非方法调用在括号之间包含参数列表,否则Ruby会假定receiver::Thing
方法调用实际上是在访问接收器中的常量Thing
的尝试.
When a receiver is explicitly specified in a method invocation, it may be separated from the method name using either a period (
.
) or two colons (::
). The only difference between these two forms occurs if the method name starts with an uppercase letter. In this case, Ruby will assume that areceiver::Thing
method call is actually an attempt to access a constant calledThing
in the receiver unless the method invocation has a parameter list between parentheses.
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