loginUser(newEmail: string, newPassword: string): firebase.Promise<any> {
return this.afAuth.auth.signInWithEmailAndPassword(newEmail, newPassword)
   .then(newUser => {
    const x = this.afAuth.auth.currentUser.uid;
    //var x = firebase.auth().currentUser.uid;

    if (x != null) {
      firebase.database().ref('/Users').child(newUser.uid).set({
        email: newEmail,
      })

       firebase.database().ref('/Quiz/').child(newUser.uid).push({
        First_Quiz:[{
          Passed:false,
          Score:0,
          Quiz:2,
        },{
          Passed:false,
          Score:0,
          Quiz:3,
        },{
          Passed:false,
          Score:0,
          Quiz:4,
        }
      ]
      })
    } else {
      firebase.database().ref('/Users').child(newUser.uid)
    }
  })