title: How to check if an object is of type Blob?
body: <p>Is it possible to check if an object is of type Blob in JavaScript? </p>
  
  <p>I'm getting the following error: </p>
  
  <blockquote>
    <p>TypeError: Argument 1 of FileReader.readAsDataURL does not implement
    interface Blob.</p>
  </blockquote>