! 是什么意思？ Ruby 方法名称后面的含义是什么？
Possible Duplicate:
Why are exclamation marks used in Ruby methods?
While looking over some Ruby code I came across this method:
def SomeMethod!
// ...
end
What does the ! following the method name do?
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我相信这只是一种将方法标记为“比其他方法更危险”的约定。这可能意味着它具有影响其参数或类属性的副作用。这只是提醒要小心。
I believe it's just a convention to mark a method as 'more dangerous than others." This could mean that it has a side effect that affects its parameters or maybe its class attributes. It's just a reminder to be careful.
按照惯例，这意味着该方法会改变类的状态。
By convention it means that the method mutates the state of the class.
方法名称末尾的感叹号意味着此类方法以比不带
!的相同方法的版本更危险的方式执行操作。请注意，如果没有这样的其他方法，则永远不应该使用
!。您可以将!理解为一种在视觉上区分两个等效方法的方法。示例：
Array#flattenArray#flatten!Kernel#exit！内核#退出The exclamation mark at the end of a method's name means that such a method performs an operation in a more dangerous way than the version of the same method without the
!.Notice that you should never ever use
!if there is not such other method. You can understand!as a means to visually differentiate between two otherwise equivalent methods.Example:
Array#flattenArray#flatten!Kernel#exit!Kernel#exit