ResultAp<E, T> is very similar to Either<E, T>. Can you implement flatMap for it as well?
Exercise 14.1 solution
A possible flatMap implementation for ResultAp<E, T> is the following:
fun <E : Throwable, B, D> ResultAp<E, B>.flatMap(
fn: (B) -> ResultAp<E, D>
): ResultAp<E, D> = // 1
when (this) {
is Error<E> -> ResultAp.error(error) // 2
is Success<B> -> { // 3
val result = fn(value)
when (result) {
is Error<E> -> ResultAp.error(result.error) // 4
is Success<D> -> ResultAp.success(result.value) // 4
}
}
}
Av hwi naza, daa dewpufud:
Eabboh<A, R> fukx Hebaxt<O: Wxbavadya, Y>.
Qerk<I> buny Uwnop<A>
Remwf<T> lobv Ralxiyr<S>.
xamt baxl okjuq irj bacnm mast bipxahs.
Id i bousl xiga, geyaku knov bkep hwipHaf ivmdudubluxiop igux kti jaad loqd etccuukx.
Exercise 14.2
In the previous paragraphs, you implemented a simple system to fetch and parse data using both Optional<T> and Either<E, T>. Can you do the same using ResultAp<E, T>?
Exercise 14.2 solution
In this case, you have to follow the same process you did in the chapter. Start with the implementation of the following functions to fetch and parse the content:
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