how to map data from database into drop down list reactjs code example

Example 1: how to load a drop down list in reactjs using json data

export const Cities = {    cities : [        { Key: 1, Value: 'London' },        { Key: 2, Value: 'New York' },        { Key: 3, Value: 'Colombo' }        ]}export default Cities;

Example 2: how to load a drop down list in reactjs using json data

<FormControl as="select" onChange={(e) => this.handleCities(e)}>    {Cities.cities && Cities.cities.map((e, key) => {    return <option key={key} value={e.Key}>{e.Value}</option>; })}