JS - Duplicate Elements in the Array

Question

Okay i can't explain what i'm trying to do . but i can explain whit code.

i have this array :

var array = [{name:"John",lastname:"Doe"},{name:"Alex",lastname:"Bill"},{name:"John",lastname:"Doe"}]

the array contains 2 elements duplicated , I want a function that shows me only once an element duplicate

when you apply the function this will be the result of the array

var array = [{name:"John",lastname:"Doe"},{name:"Alex",lastname:"Bill"}]

Possible duplicate of [Remove Duplicates from JavaScript Array](http://stackoverflow.com/questions/9229645/remove-duplicates-from-javascript-array) — Matt Way, May 27 '16 at 04:02

score 2 · Accepted Answer · answered May 27 '16 at 02:36

You can achieve it with javascript filter function in old fashioned way.

var array = [{name:"John",lastname:"Doe"},{name:"Alex",lastname:"Bill"},{name:"John",lastname:"Doe"}]
var names = [];

array = array.filter(function (person) {
   var fn = person.name + '-' + person.lastname;
   if (names.indexOf(fn) !== -1) {
      return false;
   }
   else {
      names.push(fn);
      return true;
   }
});

console.log(array); 
// [{"name":"John","lastname":"Doe"},{"name":"Alex","lastname":"Bill"}]

Jagajit Prusty · Answer 2 · 2016-05-27T03:24:26.520

0

you use lodash library which gives you many array/object & string functions.

var array = [{name:"John",lastname:"Doe"},{name:"Alex",lastname:"Bill"},{name:"John",lastname:"Doe"}]

_.uniqWith(array, _.isEqual);//[{name:"John",lastname:"Doe"},{name:"Alex",lastname:"Bill"}]

The above code will check deep equality of each object and create a unique array.
Docs : lodash uniqWith

edited May 27 '16 at 03:24

answered May 27 '16 at 02:27

Jagajit Prusty

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Lodash and underscore are different libraries. – zerkms May 27 '16 at 02:30
@zerkms Thanks for your input. I thought both are different only by name but does the same job with reference to functionality. – Jagajit Prusty May 27 '16 at 03:25

score 0 · Answer 3 · answered May 27 '16 at 02:44

the very simple way is use the underscore

var array = [{name:"John",lastname:"Doe"},{name:"Alex",lastname:"Bill"},{name:"John",lastname:"Doe"}]  

array  = _.uniq(array , false, function(p) {
                 return p.name;
            });

use the unique to achive

JS - Duplicate Elements in the Array

3 Answers3