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func isEqual(_ object: Any?) -> BoolanObjectThe object to be compared to the receiver. May be nil, in which case this method returns false.
true if the receiver and an are equal, otherwise false.
This method defines what it means for instances to be equal. For example, a container object might define two containers as equal if their corresponding objects all respond true to an is request. See the NSData, NSDictionary, NSArray, and NSString class specifications for examples of the use of this method.
If two objects are equal, they must have the same hash value. This last point is particularly important if you define is in a subclass and intend to put instances of that subclass into a collection. Make sure you also define hash in your subclass.
var hash: Intfunc `self`() -> Self