Home Developer Why use Try instead of Scala Try Catch

Why use Try instead of Scala Try Catch

Author

Date

Category

Scala try catch is always an option when writing Scala code for Java like exception control flows.
However, you also have the option of start using the Try type.

Scala try catch vs Try

Try was introduced in Scala 2.10 and behaves as a mappable Either without having to select right or left.

In the example below, taken from the Scala API:

def divide: Try[Int] = {  
  val dividend = Try(Console.readLine("Enter an Int that you'd like to divide:n").toInt)
  val divisor = Try(Console.readLine("Enter an Int that you'd like to divide by:n").toInt)
  val problem = dividend.flatMap(x => divisor.map(y => x/y))
  problem match {
    case Success(v) =>
      println("Result of " + dividend.get + "/"+ divisor.get +" is: " + v)
      Success(v)
    case Failure(e) =>
      println("You must've divided by zero or entered something that's not an Int. Try again!")
      println("Info from the exception: " + e.getMessage)
      divide
  }
}

You can see how, instead of using explicit try and catch to treat exceptions, Try is used to encapsulate the operation which is always an instance of either Success or Failure.

Benefits

You get, according again to the official documentation the:

[..] ability to pipeline, or chain, operations, catching exceptions along the way. You can map as you would a collection, an option or a right projection of an Either.

Furthermore, they encode exceptions in the Type system allowing for better documentation and clearer intention.
The Effective Scala[2] guide states:

using Option or com.twitter.util.Try are good, idiomatic choices, as they harness the type system to ensure that the user is properly considering error handling.

Start enforcing it today with Codacy

Login to your account and enable the pattern “Enforce usage of the Try object” to enforce it in your projects

1: Scala API http://www.scala-lang.org/api/current/index.html#scala.util.Try
2: Effective Scala http://twitter.github.io/effectivescala

Learn more about Scala

Check out other Scala resources on our blog.


Edit: We just published an ebook: “The Ultimate Guide to Code Review” based on a survey of 680+ developers. Enjoy!

About Codacy

Codacy is used by thousands of developers to analyze billions of lines of code every day!

Getting started is easy – and free! Just use your  GitHub, Bitbucket or Google account to sign up.

GET STARTED

LEAVE A REPLY

Please enter your comment!
Please enter your name here

Subscribe to our newsletter

To be updated with all the latest news, offers and special announcements.

Recent posts

New Public Product Roadmap – See What's In Store For Q1

We’re excited to release a public product roadmap for 2020.  Now, those outside Codacy can see what our team is working on...

4 Trends To Boost Software Quality in 2020

Today’s abundance of technology has created an increased demand for higher software quality. With companies aware of this, spending on IT worldwide...

7 Reasons Dev Teams Choose Codacy Over Other Automated Code Review Tools

Today more than 100,000 developers at leading global organizations like PayPal and Adobe across industries use Codacy (read customer case studies). ...

Introducing GitHub Sync For Seamless User Management

Announcing GitHub Sync: Synced Organizations For GitHub We are thrilled to announce "GitHub Sync" -- automatic user and repository...

Ringing In 2020 With Codacy

It’s been an exciting 2019 at Codacy and we expect more excitement in 2020. Over the last 12 months we’ve built out...