ruby 类（类型）检查
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Class (Type) checking
提问by sawa
Is there a good library (preferably gem) for doing class checking of an object? The difficult part is that I not only want to check the type of a simple object but want to go inside an array or a hash, if any, and check the classes of its components. For example, if I have an object:
是否有一个好的库（最好是 gem）来进行对象的类检查？困难的部分是我不仅想检查一个简单对象的类型，而且想进入一个数组或散列（如果有），并检查其组件的类。例如，如果我有一个对象：
object = [
"some string",
4732841,
[
"another string",
{:some_symbol => [1, 2, 3]}
],
]
I want to be able to check with various levels of detail, and if there is class mismatch, then I want it to return the position in some reasonable way. I don't yet have a clear idea of how the error (class mismatch) format should be, but something like this:
我希望能够检查各种级别的细节，如果存在类不匹配，那么我希望它以某种合理的方式返回位置。我还不清楚错误（类不匹配）格式应该如何，但类似这样：
object.class_check(Array) # => nil (`nil` will mean the class matches)
object.class_check([String, Fixnum, Array]) # => nil
object.class_check([String, Integer, Array]) # => nil
object.class_check([String, String, Array]) # => [1] (This indicates the position of class mismatch)
object.class_check([String, Fixnum, [Symbol, Hash]) # => [2,0] (meaning type mismatch at object[2][0])
If there is no such library, can someone (show me the direction in which I should) implement this? Probably, I should use kind_of?and recursive definition.
如果没有这样的库，有人可以（向我展示我应该遵循的方向）实现这个吗？也许，我应该使用kind_of?递归定义。
回答by Ed S.
is_a?or kind_of?do what you are asking for... though you seem to know that already(?).
is_a?或者kind_of?做你所要求的......虽然你似乎已经知道了（？）。
回答by undur_gongor
Here is something you can start with
你可以从这里开始
class Object
def class_check(tclass)
return self.kind_of? tclass unless tclass.kind_of? Array
return false unless self.kind_of? Array
return false unless length == tclass.length
zip(tclass).each { | a, b | return false unless a.class_check(b) }
true
end
end
It will return trueif the classes match and falseotherwise.
true如果类匹配，false则返回，否则返回。
Calculation of the indices is missing.
缺少指数的计算。
