```override fun getElements(): Either<Throwable...

# arrow

[Sergio Crespo Toubes]

override fun getElements(): Either<Throwable, List<Element>> {
	return elementsApi.getElements(authToken)
		.async(IO.async())
		.fix()
		.unsafeRunSync()
		.unwrapBody(Either.applicativeError())
		.fix()
}

This is working for me, but is the good way for using arrow with retrofit? getElements return CallK object.

[raulraja]

Ideally you never abandon IO

[raulraja]

IO is more powerful than Either and if your functions are effectful and want to keep them pure you should return IO until at the edge you call unsafeRunAsync or equivalent

[Sergio Crespo Toubes]

but how can i unwrap the response without abandon IO?

[raulraja]

elementsApi.getElements(authToken)
        .async(IO.async())
        .fix()
        .attempt()

[raulraja]

or if you don't want the nested either don't call attempt

[raulraja]

that should return an IO value you can still compose

[raulraja]

https://arrow-kt.io/docs/integrations/retrofit/#using-callk-with-io

[simon.vergauwen]

fun getElements(): IO<List<Element>> has the same semantics as Either<Throwable, ..> and allows for similar error handling with errorHandleWith, attempt or similar combinators.

[Sergio Crespo Toubes]

Thanks for your help