Using fp-ts for Functional Programming in TypeScript/

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Solution Review: Working with TaskEither

Solution Review: Working with TaskEither

Learn to use TaskEither in a function.

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Solution

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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}`))
    )();
};

Explanation

Here’s a line-by-line explanation of the solution above:

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