Since Java 8 you can use Long.hashCode(guid); For older versions of Java you can use the following: Long.valueOf(guid).hashCode(); Note that this solution creates a new Object for the stack, while the first doesn’t (although it is likely that Java optimizes the object creation away..) Looking at the docs, both ways just use the following algorithm: … Read more
The other answers seem to indicate that the difference in behavior is due to Integers being immutable and Arrays being mutable. But that is misleading. The difference is not that the creator of Ruby decided to make one immutable and the other mutable. The difference is that you, the programmer decided to mutate one but … Read more
Forget about the term “best”. No matter which hash algorithm anyone might come up with, unless you have a very limited set of data that needs to be hashed, every algorithm that performs very well on average can become completely useless if only being fed with the right (or from your perspective “wrong”) data. Instead … Read more
I’m not sure if it’s the best choice, but here is a hash function for strings: The Practice of Programming (HASH TABLES, pg. 57) /* hash: compute hash value of string */ unsigned int hash(char *str) { unsigned int h; unsigned char *p; h = 0; for (p = (unsigned char*)str; *p != ‘\0’; p++) … Read more
For a URL like http://[www.example.com]:80/search?q=devmo#test hash – returns the part of the URL that follows the # symbol, including the # symbol. You can listen for the hashchange event to get notified of changes to the hash in supporting browsers. Returns: #test href – returns the entire URL. Returns: http://[www.example.com]:80/search?q=devmo#test Read More
The hash code of an object does not need to be unique. The checking rule is: Are the hash codes equal? Then call the full (slow) Equals method. Are the hash codes not equal? Then the two items are definitely not equal. All you want is a GetHashCode algorithm that splits up your collection into … Read more
You can use update (alias of merge!) to update each value using a block: hash.update(hash) { |key, value| value * 2 } Note that we’re effectively merging hash with itself. This is needed because Ruby will call the block to resolve the merge for any keys that collide, setting the value with the return value … Read more
Git uses the following information to generate the sha-1: The source tree of the commit (which unravels to all the subtrees and blobs) The parent commit sha1 The author info (with timestamp) The committer info (right, those are different!, also with timestamp) The commit message (on the complete explanation; look here). Git does NOT guarantee … Read more
Finally I found an implementation of scrypt in C# in the CryptSharp library. The library is open source and uses the ISC license. CryptSharp Version History 1.2.0 January 23, 2011: The SCrypt KDF is now supported as CryptSharp.Utility.SCrypt. Added djb’s Salsa20, required by SCrypt.
A good hash function will provide a near uniform distribution over the key space. This reduces the question to how do I convert a random 32 bit number to a 3 byte RGB space. I see nothing wrong with just taking the low 3 bytes. int hash = string.getHashCode(); int r = (hash & 0xFF0000) … Read more