postal-code.js

/**
 * "Shortester" Polish postal code validator without regular expressions
 * Only 86 characters (when not couting the module export)!
 *
 * @params {string} code to validate
 * @author Marcin Gajda (and KevSlashNull)
 */

v=c=>!!(c[4]&&+('1.'+c.slice(0,2)+c.slice(-3))&&' -_'.includes(c.slice(2,-3)))

module.exports = v;