Javascript array manipulation question

Hi All,

I want to convert flat oData to a tree-structured array of a data. As an example I took this : javascript - SAPUI5 create JSON for TreeTable / empty rows - Stack Overflow

Code :

var oData = new sap.ui.model.odata.ODataModel("http://52.16.73.119:8000/sizegrid/ztest/services/cartons.xsodata/", true);

oData.read("Cartons/", null, null, false,

     function(oData, oResponse){ 

          for (var i = 0; i < 3; i++) {

               var key = 'SPORTS_CODE' + oData.results[i].SPORTS_CODE;

               flat[key] = oData.results[i];

               flat[key].__metadata = "";

          }

     for (var i in flat) {

            flat[i].children = [];

      }

     for (var i in flat) {

          var parentkey = 'SPORTS_CODE' + flat[i].SPORTS_CODE;

          if (flat[parentkey]) {

               flat[parentkey].children.push(flat[i]);

          }

     }

right after the push(flat[i]) statement, I get nested array of data into array flat. And that is nested to infinity :

Seems I'm doing something totally wrong with array, but can't figure out what. Any help, please ?

What I wanted to achieve, as actually a 2-level data structure with the child node = parent node.

Thanks !