Javascript: Data Object merging -

i wondering if there's way merge element in object if have same property.

here mean:

var dummy = {  data: [      {name: 'a', info: '1'},      {name: 'b', info: 'a'},      {name: 'c', info: '2'},      {name: 'a', info: '2'},      {name: 'b', info: '2'}    ] };  var expected_results = {  data: [   {name: 'a', info: '1,2'},   {name: 'b', info: 'a,2'},   {name: 'c', info: '2'}  ] }  //todo if same name merge if not seperate var plugin = {  unique: {     list: []  },   merge: function(params) {    var lists = plugin.unique.list;    lists.push(params[0]); //first unique    $.each(params, function(index, item) {       if(index !== 0) {          $.each(lists, function(index, list) {             if(list.name === item.name) {                list.info += ',' + item.info;             } else {                lists.push(item);             }          })       }    })    return lists;   }  };  console.clear(); var list = plugin.merge(dummy.data); console.log('result',list); 

i think i'm close not quite sure whent wrong loop...:(

to honest, if you're going grouping key might use object rather array returned data structure. easier manipulate.

function squish(dummy) {    // pass in initial empty object   // if key isn't there, create , use array   // value - push in value   var out = dummy.data.reduce(function (p, c) {     if (!p[c.name]) p[c.name] = [];     p[c.name].push(c.info);     return p;   }, {});    // flatten arrays each key   object.keys(out).foreach(function (el) {     out[el] = out[el].join(',');   });    // return expected_result   return out; }  squish(dummy); 

demo

output

{   "a": "1,2",   "b": "a,2",   "c": "2" } 

but, if want have array of objects, that's simple enough too:

function squish2(dummy) {   var out = dummy.data.reduce(function (p, c) {     if (!p[c.name]) p[c.name] = [];     p[c.name].push(c.info);     return p;   }, {});   return object.keys(out).map(function (el) {     return { name: el, info: out[el].join(',') };   }); } 

demo

output

[   { "name": "a", "info": "1,2" },   { "name": "b", "info": "a,2" },   { "name": "c", "info": "2" } ]