function generateActionNames(namespace, baseUrl) {
  const stages = ["REQUEST", "SUCCESS", "FAILURE"];
  const methods = ["GET", "ADD", "UPDATE", "DELETE"];
  const actionNames = doMagic(namespace, methods, method =>
    doMagic(method, stages, stage => stage)
  );
  return actionNames;
}

function doMagic(prefix, keys, makeValue) {
  return keys.reduce(
    (result, key) => ({
      ...result,
      [key.toLowerCase()]: makeValue(`${prefix}_${key}`)
    }),
    {}
  );
}