Get Programming with Scala

40 Error handling with Try

After reading this lesson, you will be able to

• Represent a computation that can fail using Try
• Decompose it using pattern matching
• Manipulate its value using the map, flatten, and flatMap operations
• Chain several Try instances using for-comprehension
• Check if a computation has failed and retrieve its value

In the previous lessons, you mastered the type Either. In this lesson, you’ll learn about the class Try to represent a computation that can fail. Throwing exceptions is a risky and unpredictable practice. Knowing which exceptions a method may throw is challenging, if not impossible, as they are often not annotated and are highly dependent on the specifics of their implementation. The class Try allows you to control ...