Solution

TypeScript 3.3.4

const application = (input: string) => {
    return pipe(
        checkInput(input),
        TE.fromEither,
        TE.chain((input: string) => TE.tryCatch(() => externalService(input), errorMapper)),
        TE.map(toUpperCase),
        TE.getOrElse((err) => T.of(`We got back an error: ${err}`))
    )();
};

Introduction to Functional Programming

Tidbits: Some Useful JavaScript and TypeScript

First Steps with Functional Programming

Our First Project: User Registration

Deploying a Monitoring Application

Testing

Automate Login-Workflow Testing with Playwright

Once More unto the Breach: Our Final Application

Expanding our Reservation Application

Rewriting an Application

Advanced FP Techniques

Conclusion

Appendix

Solution Review: Working with TaskEither

Solution

Explanation