Michael Tsai on Twitter: "@rosyna @Catfish_Man I think mutable objects make an array invalid as a key regardless of the hash function because they break equality."

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Michael Tsai ‏@mjtsai Aug 25

Foundation Hashing: http://mjtsai.com/blog/2016/08/25/foundation-hashing/ … #mjtsaiblog
3 retweets 4 likes
Jonathan Grynspan ‏@grynspan Aug 25 Toronto, Ontario

@mjtsai @tapbot_paul If you find room for improvement in Foundation, I know a bug report would always be appreciated! // @Catfish_Man
David Smith ‏@Catfish_Man Aug 25 Cupertino, CA

@grynspan @mjtsai @tapbot_paul using the length is a good idea. We change that.
2 likes
Michael Tsai ‏@mjtsai Aug 25

@Catfish_Man @grynspan @tapbot_paul Would be nice for it to use the length for NSData. I wonder why that wasn’t done.
David Smith ‏@Catfish_Man Aug 25 Cupertino, CA

@mjtsai @grynspan @tapbot_paul just an oversight afaik. Not all that many people hitting that code path. Should be a safe fix.
1 like
Michael Tsai ‏@mjtsai Aug 25

@Catfish_Man Cool. For NSArray, seems obvious to pick a few elements to combine. Am I missing something? NSDictionary seems harder.
Rosyna Keller ‏@rosyna Aug 25

@mjtsai @Catfish_Man Arrays containing mutable objects?

‏@mjtsai

@rosyna @Catfish_Man I think mutable objects make an array invalid as a key regardless of the hash function because they break equality.

2:28 PM - 25 Aug 2016

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