Making URLs

url.js

function URLPathname(pathname, search, hash) {
  this.pathname = pathname;
  this.search = new URLSearchParams(search);
  this.hash = hash;
}

URLPathname.prototype.resolve = function (parameters) {
  if (this.pathname) {
    var resolved = this.pathname;

    switch (Object.prototype.toString.call(parameters)) {
      case '[object Array]':
        for (var parameter of parameters)
          resolved = resolved.replace(':' + parameter.at(0), parameter.at(1));
        break;

      case '[object Object]':
        for (var parameter in parameters)
          resolved = resolved.replace(':' + parameter, parameters[parameter]);
        break;
    }

    if (this.search.size && this.hash) {
      return resolved + '?' + this.search + '#' + this.hash;
    } else if (this.search.size) {
      return resolved + '?' + this.search;
    } else if (this.hash) {
      return resolved + '#' + this.hash;
    } else {
      return resolved;
    }
  }
};

URLPathname.prototype.toString = function () {
  if (this.pathname) {
    if (this.search.size && this.hash) {
      return this.pathname + '?' + this.search + '#' + this.hash;
    } else if (this.search.size) {
      return this.pathname + '?' + this.search;
    } else if (this.hash) {
      return this.pathname + '#' + this.hash;
    } else {
      return this.pathname;
    }
  }
};

URLPathname.prototype[Symbol.toPrimitive] = function (hint) {
  switch (hint) {
    case 'string':
    case 'default':
      return this.toString();

    default:
      return null;
  }
};

URLPathname.of = (...parameters) => new URLPathname(...parameters);

URLPathname[Symbol.toStringTag] = 'URLPathname';