donotation.ts

import * as TE from "fp-ts/TaskEither";
import { pipe } from "fp-ts/function";

const createUser = (username: string): TE.TaskEither<Error, string> => {
  return TE.right(`UserId-${username}`);
};

const createOrder = (userId: string): TE.TaskEither<Error, string> => {
  return TE.right(`Order-${userId}`);
};

const createOrderRow = (
  orderId: string,
  userId: string
): TE.TaskEither<Error, string> => {
  return TE.right(`OrderRowFor-${orderId}-${userId}`);
};

const main = pipe(
  TE.Do,
  TE.bind("userId", () => createUser("Rick")),
  TE.bind("orderId", ({ userId }) => createOrder(userId)),
  TE.bind("orderRowId", ({ userId, orderId }) =>
    createOrderRow(userId, orderId)
  ),
  TE.map(({ userId, orderId, orderRowId }) => ({
    userId,
    orderId,
    orderRowId,
  }))
);

// The function above will return something likes
// {
//   _tag: 'Right',
//   right: {
//     userId: 'UserIdRick',
//     orderId: 'Order123456-UserIdRick',
//     orderRowId: 'OrderRowFor-UserIdRick-Order123456-UserIdRick'
//   }
// }