List[Try[T]] to Try[List[T]] in Scala

Question

I would like to know how to convert a List[Try[T]] into Try[List[T]] in Scala?

I have tried using an accumulator and folding right but it doesn't seem ideal.

Answer 1

Using cats it's as easy as:

import cats._
import cats.data._
import cats.implicits._
import scala.util.{Try, Success, Failure}

val tries: List[Try[Int]] = List(Success(1), Success(2), Success(3))
tries.sequence

More information in the Traverse docs.

Answer 2

Try(list.map(_.get))

This will return only the first failure, so you need something more complicated if you want to catch all the failures in the list.