Fonction récursive tableau à plusieurs dimensions

/* Will flatten all objects and send back columns and sub-columns at the same level */
          var flattenObject = function(ob) {
            var toReturn = {};

            /* For each object */
            for (var i in ob) {
              if (!ob.hasOwnProperty(i)) continue;

              /* If it is an other object */
              if ((typeof ob[i]) == 'object') {
                var flatObject = flattenObject(ob[i]);
                /* For each object in the object it will return the name key.key-under */
                for (var x in flatObject) {
                  if (!flatObject.hasOwnProperty(x)) continue;
                  toReturn[i + '.' + x] = flatObject[x];
                }
              } else // If there is no other under object
                toReturn[i] = ob[i];
            }
            return toReturn;
          };