CODEWITHSUNDEEP
javascriptarraysobject
Rad haru
Rad haru

Reputation: 13

Print duplicate items which have the same property

How can I get items duplicate properties and push it in the object?

For example I have:

var object = { "1" :{"ip": 4},  "2" :{"ip": 3}, "3" :{"ip": 4}, "4" :{"ip": 3}}

I expect to have an object or array where I will have [[1,3], [2,4]]

Upvotes: 1

Views: 78

Answers (3)

gurvinder372
gurvinder372

Reputation: 68393

I expect to have an object or array where I will have {[1,3], [2,4]}

If you meant [[1,3], [2,4]], then use reduce and Object.values

Demo

var object = { "1" :{"ip": 4},  "2" :{"ip": 3}, "3" :{"ip": 4}, "4" :{"ip": 3}};

var output = Object.values(Object.keys( object ).reduce( function( a, b){
   var key = object[ b ].ip; //key to be used for grouping the values
   a[ key ] = a[ key ] || [];
   a[ key ].push( Number(b) );
   return a;
} ,{}));

console.log( output.reverse() );

Upvotes: 2

Hassan Imam
Hassan Imam

Reputation: 22534

You can use array#reduce and JSON.stringify the values as key and add the key which have the same values.

var object = { "1" :{"ip": 4},  "2" :{"ip": 3}, "3" :{"ip": 4}, "4" :{"ip": 3}};

var result = Object.keys(object).reduce((map,key) => {
  var k = JSON.stringify(object[key]);
  map[k] =  map[k] || [];
  map[k].push(key);
  return map;
},{});
var output = Object.values(result);
console.log(output);

Upvotes: 0

Nenad Vracar
Nenad Vracar

Reputation: 122047

You can use reduce() and ES6 Map and return array of arrays.

var object = { "1" :{"ip": 4},  "2" :{"ip": 3}, "3" :{"ip": 4}, "4" :{"ip": 3}}

var result = [...Object.keys(object).reduce((r, e) => {
  let ip = object[e].ip
  if(!r.get(ip)) r.set(ip, [e]);
  else r.get(ip).push(e);
  return r;
}, new Map).values()];

console.log(result)

Upvotes: 0

Related Questions