Object.create() bug?

Question

function create_RowsEditor(tableId, rowTmplId) {
  rowsEditor = Object.create(null, {
    'XtableId': tableId,
    'XrowTmplId': rowTmplId
  });
  return rowsEditor;
}

$(function() {
  var rowsEditor = create_RowsEditor('come', 'tmpl_row');
});

Error: TypeError: value is not a non-null object

Where is the error?

Answer 1

You cannot pass an arbitrary object as second parameter, it has to be an object of property descriptors. For example:

rowsEditor = Object.create(null, {
  'XtableId': {
      value: tableId
  },
  'XrowTmplId': {
      value: rowTmplId
  }
});

From the documentation:

If specified and not undefined, an object whose enumerable own properties (that is, those properties defined upon itself and not enumerable properties along its prototype chain) specify property descriptors to be added to the newly-created object, with the corresponding property names. These properties correspond to the second argument of Object.defineProperties.

Detailed information about the structure of property descriptors can be found in the Object.defineProperty documentation. As shown in the code above, the value property specifies the value of the property.