Get Total Number of Same Objects in JavaScript

Suppose, we have an array of objects describing the routes of some flights like this −

const routes = [
   {
      flyFrom: "CDG",
      flyTo: "DUB",
      return: 0,
   },
   {
      flyFrom: "DUB",
      flyTo: "SXF",
      return: 0,
   },
   {
      flyFrom: "SFX",
      flyTo: "CDG",
      return: 1,
   }
];

We need to count how many times there is return − 0 and how many times there is the return: 1.

The end output should look like −

for the cases where return: 0 appears 2 times --- 1 Stop
for the cases where return: 1 appears 1 time --- Non-stop

Example

The code for this will be −

const routes = [
   {
      flyFrom: "CDG",
      flyTo: "DUB",
      return: 0,
   },
   {
      flyFrom: "DUB",
      flyTo: "SXF",
      return: 0,
   },
   {
      flyFrom: "SFX",
      flyTo: "CDG",
      return: 1,
   }
];
const displaySimilar = arr => {
   const count = {};
   arr.forEach(el => {
      count[el.return] = (count[el.return] || 0) + 1;
   });
   Object.keys(count).forEach(key => {
      for(let i = 0; i < count[key]; i++){
         if(key === '0'){
            console.log('1 Stop');
         }
         else if(key === '1'){
            console.log('Non-stop');
         };
      }
   })
};
displaySimilar(routes);

Output

And the output in the console will be −

1 Stop
1 Stop
Non-stop