How to merge objects with same key in javascript?

Question

I have a array called as commondata

commondata = [{
   giverUser: 'Abc',
   createdAt: '2016 11: 48: 40',
   note: 'Test'
 }, {
   giverUser: 'Xyz',
   createdAt: '12: 22: 37',
   note: 'Test data'
 }, {
   giverUser: 'Abc',
   createdAt: '2016 14: 22: 07',
   note: '"test123"'
 }];

When I am trying to merge the above array of object with following code, I am getting same array as it was.

Below is my code:

commondata.forEach(function(a, i) {

  if (!this[a.giverUser]) {

    this[a.giveruser] = {
      giverUser: a.giverUser,
      createdAt: [],
      note: []
    };
    r_grouped.push(this[a.giveruser]);
  }

  this[a.giveruser].createdAt = this[a.giveruser].createdAt.concat(a.createdAt);
  this[a.giveruser].note = this[a.giveruser].note.concat(a.note);
}, Object.create(null));

What is wrong in above code ? why I am not getting merger array with same giveruser ?

Your answer is already in here. stackoverflow.com/questions/171251/… — 0xdw
– 0xdw, Commented Apr 27, 2016 at 15:15
@DININDU : my code has single array of object and not two different objects..please see carefully! — Akki
– Akki, Commented Apr 27, 2016 at 15:19
@Akki developer.mozilla.org/en/docs/Web/JavaScript/Reference/… — 0xdw
– 0xdw, Commented Apr 27, 2016 at 15:20

Nina Scholz · Accepted Answer · 2016-04-27 15:19:49Z

You have some typos with giveruser should be giverUser

Rest is working fine

var commondata = [{ giverUser: 'Abc', createdAt: '2016 11:48:40', note: 'Test' }, { giverUser: 'Xyz', createdAt: '12:22:37', note: 'Test data' }, { giverUser: 'Abc', createdAt: '2016 14:22:07', note: '"test123"' }],
    r_grouped = [];

commondata.forEach(function (a, i) {
    if (!this[a.giverUser]) {
        this[a.giverUser] = { giverUser: a.giverUser, createdAt: [], note: [] };

        r_grouped.push(this[a.giverUser]);
    }
    this[a.giverUser].createdAt.push(a.createdAt);
    this[a.giverUser].note.push(a.note);
}, Object.create(null));

document.write('<pre>' + JSON.stringify(r_grouped, 0, 4) + '</pre>');

Just another annotation

this[a.giverUser].createdAt = this[a.giverUser].createdAt.concat(a.createdAt);

this is not necessary if the value is just not an array. You can take push instead.

this[a.giverUser].createdAt.push(a.createdAt);

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