Generates unique id
How does it work
Internally, it uses a
pseudo-encrypt function based on a similar name from the Postgre Wiki. This encryption (not hashing) function generates a unique 32-bit signed integer from a given 32-bit integer. Since the function is an encryption, we can also infer that the
pseudoEncrypt(pseudoEncrypt(x)) = x;.
Secondly, the resulting integer is used as a basis for generating a unique code. The integer is converted to the base-N sequence of characters constructed by the alphabet definition.
Users may define their own alphabet sequence, or their own sauce (a permutation formula being used inside
pseudo-encrypt that produces a value between 0 and 1), to produce a completely different sequence of ids.
This package exports a default class named "UniqueIdGenerator". This class creates an instance for generating unique ids.
The constructor for UniqueIdGenerator may receive two parameters:
alphabet- the base of character encryption. The default sequence is
sauce- a permutation formula used for the
pseudo-encryptalgorithm. The default is
((1366 * r1 + 150889) % 714025) / 714025.0)where
r1is a 16-bit value.
Once an instance is constructed, the
next method can be used to generate a unique string. This method receives a number that is used by the
- Stack Overflow: https://stackoverflow.com/a/12590064