title: Checking if text field is empty
body: <p>I am attempting to check if a text field is empty but am getting an error of "Type (Bool, Bool, Bool) does not conform protocol 'Boolean Type' "</p>
  
  <pre><code> if(userEmail == "", userPassword == "", userRepeatPassword == "") {
  
  
          alertMessage("All fields are required")
          return
  
      }
  </code></pre>
  
  <p>I am using xcode 7 </p>