title: Array created by .push in a loop is the correct length but only pushing the last element on repeat
body: <p>I am referencing a global variable and parsing through it to push items onto a stack and then I return that stack to be used elsewhere. The returned array is the correct length but it repeats items of the last element.</p>
  
  <pre><code>var global = {
      "param11": {
          "param21": {
              "param31": {
                  "param4": "1",
                  "param5": "2",
                  "param6": "3",
              },
              "param32": {
                  "param4": "4",
                  "param5": "5",
                  "param6": "6",
  
              }
          },
          "param22": {
              "param33": {
                  "param4": "7",
                  "param5": "8",
                  "param6": "9",
              }
          }
      },
      "param12": {
          "param23": {
              "param34": {
                  "param4": "10",
                  "param5": "11",
                  "param6": "12",
              },
              "param35": {
                  "param4": "13",
                  "param5": "14",
                  "param6": "15",
              }
          }
      }
  };
  
  function getStack() {
      var obj = {};
      var stack=[];
      var json = JSON.parse(global);
      for(var param1 in json){
          for(var param2 in json[param1]){
              for(var param3 in json[param1][param2]){
                      obj.item1 = json[param1][param2][param3][param4];
                      obj.item2 = json[param1][param2][param3][param5];
                      obj.item3 = json[param1][param2][param3][param6];
                      stack.push(obj);
              }
          }
      }
      return stack;
  }
  </code></pre>
  
  <p>Returned value:</p>
  
  <pre><code>[
      {"param4":"13", "param5":"14", "param6":"15"},
      {"param4":"13", "param5":"14", "param6":"15"},
      {"param4":"13", "param5":"14", "param6":"15"},
      {"param4":"13", "param5":"14", "param6":"15"},
      {"param4":"13", "param5":"14", "param6":"15"}
  ]
  </code></pre>