Here’s an example of two different dictionaries, yet they return the same hash code. Why?
https://gist.github.com/837861
(They aren’t the same object)
Here’s an example of two different dictionaries, yet they return the same hash code.
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Here’s an example of two different dictionaries, yet they return the same hash code. Why?
https://gist.github.com/837861
(They aren’t the same object)
Hashes aren’t guaranteed to be distinct for distinct objects. In fact, hash collisions will happen. The only two properties the
-hashmethod is supposed to guarantee are (both taken from the documentation):If two objects are equal (as determined by the isEqual: method), they must have the same hash value.
If a mutable object is added to a collection that uses hash values to determine the object’s position in the collection, the value returned by the hash method of the object must not change while the object is in the collection.