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djb2, a non-cryptographic hash function
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package djb2 | |
// For when you ever need to implement a dictionary hash function, | |
// that's good enough, simple and fast. | |
// | |
// WARNING: | |
// Not cryptographicly secure! | |
// | |
// Source: https://en.wikipedia.org/wiki/DJB2 | |
// | |
// EXAMPLE | |
// | |
//func main() { | |
// fmt.Println(djb2("a")) | |
// fmt.Println(djb2("b")) | |
//} | |
func djb2(s string) int64 { | |
var hash int64 = 5381 | |
for _, c := range s { | |
hash = ((hash << 5) + hash) + int64(c) | |
// the above line is an optimized version of the following line: | |
//hash = hash * 33 + int64(c) | |
// which is easier to read and understand... | |
} | |
return hash | |
} |
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