JavaScript

const collectionName = 'databases' // this is my collection name
const ref = firebase.firestore().collection(collectionName);
ref.onSnapshot((snapshot) => {
  snapshot.forEach((doc) => {
    const data = doc.data();
    // ...
  });
});
//* Root Handler
app.get("/", (req, res) =>
  res.sendFile(path.join(__dirname + "/public/index.html"))
);

app.get('api/v1', (req,res) => res.json())

// Set static folder
app.use(express.static(path.join(__dirname, 'public')));

app.use('/api/v1', require('./routes/api/v1'))

app.listen(port, () => {
  console.log(`Server at: http://localhost:${port}`);
});
// Example Arrays
let filterArrayB = ['aa', 'ab', 'ac', 'ad', 'ae', 'af', 'ag']
let filterArrayA = ['aa', 'ab', 'ac', 'ae', 'af', 'ag']

// This only works if there is a 1 item difference 
compare = (a,b) => {
  let inBoth = []
  let missingItem = []
  a.forEach(item => {
    for (let i=0; i<b.length; i++){
      if (item == b[i]){
        inBoth.push(item) 
        if (i == b.length) return
      } 
      if (a.length < b.length) {
        b.forEach(item => {
          if (!a.includes(item)){
            missingItem = item
          }
        })
      } else {
          a.forEach(item => {
          if (!b.includes(item)){
            missingItem = item
          }
        })
      }
      
    }
  })
  return missingItem
}

compare(filterArrayA, filterArrayB)
    //? GETTER - GET All Technologies sorted by Date Modified
    allTechnologiesDateSorted(state) {
      return state.allTechnologies.sort((a,b) => (a.dateModified.split("-").join("") < b.dateModified.split("-").join("") ? 1 : -1));
    },

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@Andiyo