export const randomString = (length) => {
  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  let result = '';
  for ( let i = 0; i < length; i++ )
    result += characters.charAt(Math.floor(Math.random() * characters.length));
  return result;
}