append one more avalue to dropdown in jquery code example

Example 1: To append dropdown option using jquery

$('#ddlGroup').append(new Option('Select group', '0'));

Example 2: how to append the dropdown values by jquery each function

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 $.each(obj , function (key, value) {
                                $('#GroupName').append($('<option>',
                                    {
                                    value: value.id,
                                    text: value.Group_Name
                                }));