title: Is a boolean instance variable default value true or false
body: <ol>
  <li><p>if you create an instance variable in a class, is the default value true or false until otherwise changed? </p></li>
  <li><p>Is it good practice to have an instance variable as ex. true then change the value to false and use that variable throughout your class? Or is that something you should conceptually  avoid in terms of using instance variables? </p></li>
  </ol>