firebase cheat sheet

Firebase CDN
links: 
https://www.gstatic.com/firebasejs/7.14.0/firebase-app.js
https://www.gstatic.com/firebasejs/7.14.0/firebase-auth.js
https://www.gstatic.com/firebasejs/7.14.0/firebase-firestore.js
https://www.gstatic.com/firebasejs/7.14.0/firebase-analytics.js


// Authentication with Email
const auth = fireabase.auth()

auth.createUserWithEmailAndPassword(email, password).then(cred => {
  console.log(cred);
});

auth.signOut().then(() => console.log('user signed out));

auth.signInWithEmailAndPassword(email, password).then(cred => {
  console.log(cred);
})
    
auth.onAuthStateChanged(user => {
  // fired when login, sign in or logout 
  // and if user if null then user is not logged in..
}




// Firestore 

const db = firebase.firestore();

db.collection('collection_name').get().then(snapshots => {
  console.log(snapshots.docs);
});

db.collection('collection_name').add(fields here...).then(() => {
   console.log('data added...');
});


//this onShapshot allow us to set real-time listener to our database if theirs change in the database it will give us new data...
db.collection('collection_name').onSnapshot(snapshots => {
   console.log(snapshots.docs)
});