src/components/login/user.js

let rClass = /\sclass=\"[a-zA-Z_-\s]*\"/g;

export default class User {
  constructor({
    id,
    email,
    username,
    facebookUid,
    profileSlug,
    avatar = "http://dummyimage.com/80x80/4d494d/686a82.gif",
    messages = [],
    activity = []
  } = {}) {
    this.id = id;
    this.email = email;
    this.username = username;
    this.facebookUid = facebookUid;
    this.profileSlug = profileSlug;
    this.avatar = avatar.replace(/small/, "large");
    this.messages = messages;
    this.activity = activity;
  }
  toJSON() {
    let obj = {};
    for(let key in this) {
      if (this.hasOwnProperty(key)) {
        obj[key] = this[key];
      }
    }
    
    obj.messages = obj.messages.length ? obj.messages.map((msg) => {
        return { 
          text: msg.text.replace(rClass, ""),
          read: msg["read?"]
        };
      }) : null;

    obj.activity = obj.activity.length ? obj.activity : null;
    
    obj.activity_count = obj.activity ? obj.activity.length : null;
    obj.unread_message_count = obj.messages ? obj.messages.filter((msg) => !msg.read).length : null;

    obj.notification_count = (obj.activity_count || 0) + (obj.unread_message_count || 0);

    return obj;
  }
}