Why Isn't Every Data Type Hashable?

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  1. Greg Hogg
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Master Data Structures & Algorithms For FREE at AlgoMap.io!

GregHogg
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It is a common question for Java interviews, regarding HashMap class, and why hashcode fn always have to return the same valeu.

brunomillerps
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which is why you hash the pointer to the array, not the contents.

AllanSavolainen
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Frozen array haha, that is great perfectly explains what a tuple is.

Supakills
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I would argue, since we can hash current representation of an array, and we can consider any changes of array as creating completely new array, thus, different result in hash

cgulbhw
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What about using vector as key in maps C++. Vector is a key that will be hashed right?

rahulsanjay
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Im a little confused on what is happening here.
From my understanding, the only thing that goes through the hash function is a key. Why would anyone use an array as a key? Doesnt using a key that can change defeat the purpose of a hash map?
Can you explain why this is even important?

ragama
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I mean, is that wrong? Do you want, even if stored at the same place, to have a diferent list be equal? I mean, sure the pointer is the same, but the contents aren't, when using hash maps you mainly want to == compare them, and not is compare.

rodrigoqteixeira
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Now i understand mutable and immutable variables ❤❤❤

its_code
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What about Set? I thought they're mutable and hashable?

okorochaobinna