Alphanumeric Increment (alpha-inc)

Alphanumeric Increment is a simple node module for incrementing alphanumeric strings (ie. 'a0B' => 'a0C'). Useful for things like URL shorteners or anything else that could make use of incrementing strings. The incrementation order is 0-9 then a-z then A-Z. It will automatically add a new character if required. There is an optional second argument that is an array of blacklisted strings it must skip.

Usage

const alpha = require('alpha-inc');

alpha.next('1lg');
// returns: '1lh'

alpha.next('ZZ');
// returns: '000'

// Bad input
alpha.next('f*b');
// returns: null

// with blacklist
alpha.next('a', ['b', 'c']);
// returns: 'd'

alpha.next('abous', ['about']);
// returns: 'abouu'

Contributors

Want to add decrementing or fix something? I welcome PRs! Please just add tape tests for any new features you add in test/alpha-inc.spec.js

Running tests

Run tests with npm run test.

License

Licensed under the terms of the MIT license.