Group By Object array based on provided key

Group by following object array based on key "city".

const users = [

  {

    name: "sangram",

    city: "kankavali"

  },

  {

    name: "sagar",

    city: "malvan"

  },

  {

    name: "sachin",

    city: "kankavali"

  }

];

Code :

const users = [

  {

    name: "sangram",

    city: "kankavali"

  },

  {

    name: "sagar",

    city: "malvan"

  },

  {

    name: "sachin",

    city: "kankavali"

  }

];

let obj = {};

let output = users.reduce((acc, item) => {

  if (!acc[item.city]) {

    acc[item.city] = [];

  }

  acc[item.city].push(item);

  return acc;

}, obj);

console.log("Final Output:", output);

Output:

Final Output: {

  kankavali: [

    { name: 'sangram', city: 'kankavali' },

    { name: 'sachin', city: 'kankavali' }

  ],

  malvan: [ { name: 'sagar', city: 'malvan' } ]

}