overkill.js

(function($) {
  const ReviewHearts = {
    requiredProps: ['$container', '$inputs'],

    config: {},

    init(config = {}) {
      this.requiredProps.map(prop => {
	if (!config[prop]) {
	  throw new Error(`Missing required prop ${prop}`);
	}
      });

      this.config = config;
      this.addEventListener();
    },

    addEventListener() {
      const { $inputs } = this.config;

      $inputs.on('change', e => {
	this.handleChange($(e.target).data('rating'));
      });
    },

    handleChange(rating) {
      const { $container } = this.config;
      $container.data('rating', rating);
    },
  };

  const reviewHearts = Object.create(ReviewHearts);
  reviewHearts.init({
    $container: $('.rating__container'),
    $inputs: $('#product-review-stars input[type="radio"]'),
  });
}(jQuery));