Increment identifier strings.

If all character ranges are allowed, identifier strings are incremented in the following order: 0 through 9 to A through Z to a through z and back to 0. When all characters in the string are z, all the characters are reset to 0 and another 0 is added to the end of the string. If a certain character range is not allowed, then that range is skipped. For example Z will go to 0 if lowercase letters are not allowed and z will go to a if only lowercase letters are allowed.

Usage

const increment = require('incrementr');

increment();
// '1'
increment('ABZ');
// 'ABa'
increment('ABz');
// 'AC0'
increment('TEST9');
// 'TESTA'
increment('HELLO');
// 'HELLP'
increment('zzz');
// '0000'

increment('9', { characters: { numbers: true, lowercase: true } });
// 'a'
increment('Z', { characters: { uppercase: true } });
// 'AA'

increment('!');
increment('ABC9', { characters: { lowercase: true } });
increment('a99', { characters: { uppercase: true, numbers: true } });
// All throw errors because identifier does not match pattern