Custom Model Implementation

model.js

import { Model } from 'backbone';

export const MyModel = Model.extend({
  defaults: {
    counter: 0
  },
  
   /**
   * Increment our counter and return the new value.
   * @returns {number} The incremented counter
   */
  increment() {
    // I'll show our implementation later
  },

  /**
   * Increment the counter by num and return the new value.
   * @param {number} num The number to add to the counter.
   * @returns {number} The counter + num
   */
  addCounter(num) {
    // I'll show our implementation later
  }
});