Examples of hash functions

Now that we know that a hash function is just a subset of all mathematical functions, it is fairly easy to see that there can be an infinite number of hash functions, and it is not too difficult for anyone to create one. Let us look at some easy examples of hash functions to understand them better.

Identity hash function

For cases where the domain set has a fixed size, the elements in the set can be used as the hashed values. The domain and codomain sets are the same for an identity hash function, and every value is mapped to it. The input(key) can be treated as the hash value.