Functional Kotlin

Try

Try is a representation of a computation that may or may not fail. Try<A> is a sealed class with two possibles sub-classes—Failure<A>, representing a fail and Success<T> representing a successful operation.

Let's write our division example with Try:

import arrow.data.Tryfun tryDivide(num: Int, den: Int): Try<Int> = Try { divide(num, den)!! }

 The easiest way to create a Try instance is to use the Try.invoke operator. If the block inside throws an exception, it will return Failure; if everything goes well, Success<Int>, for example, the !! operator will throw NPE if divide returns a null:

fun tryDivision(a: Int, b: Int, den: Int): Try<Tuple2<Int, Int>> {   val aDiv = tryDivide(a, den)   return when (aDiv) {      is Success -> {         val bDiv = tryDivide ...