Simple decorator methods

decorator.js

/**
 * Binds a component to one or more decorator functions.
 * @param {Object} component
 * @param {[function]} decorators
 * @returns {Object}
 * @throws {Error}
 */
function Decorator(component, decorators) {
  if (!component || !decorators) {
    throw new Error('Failed to create decorator, arguments invalid.');
  }
  decorators.forEach(function (decorator) {
    component[decorator.name] = decorator.bind(component);
  });
  return component;
}

/**
 * Adds decorator functions to an item.
 * @private
 * @returns {ItemDecorator}
 */
function ItemDecorator(item) {
  return Decorator(item, [save, remove, toString]);
}