Modern applications often need to describe complex workflows involving multiple external systems. These are notoriously difficult to get right as it requires handling errors, various retry strategies and non-determinism because of concurrent executions. In this course, you will learn how to solve this problem using both imperative and functional programming.
By the end of the course, you will be able to read and write code using popular Scala libraries such as cats-effect, Monix and ZIO. This skill is in high demand.
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Modern applications often need to describe complex workflows involving multiple external systems. These are notoriously difficult to get right as it requires handling errors, various retry strategies and non-determinism because of concurrent executions. In this course, you will learn how to solve this problem using both imperative and functional programming.
By the end of the course, you will be able to read and write code using popular Scala libraries such as cats-effect, Monix and ZIO. This skill is in high demand.
Modern applications often need to describe complex workflows involving multiple external systems. These are notoriously difficult to get right as it requires handling errors, various retry strategies and non-determinism because of concurrent executions. In this course, you will learn how to solve this problem using both imperative and functional programming.
By the end of the course, you will be able to read and write code using popular Scala libraries such as cats-effect, Monix and ZIO. This skill is in high demand.
Several companies use this curriculum to on-board and train engineers. Here is a non-exhaustive list:
Lunatech
Kaluza / OVO Energy
Autoscout24
Pirum Systems
Cleverbase
These companies are constantly hiring new Scala developers. Don’t hesitate to reach out to them and mention that you took this course.
I designed this content for backend developers. It is extremely practical and hands-on. Specifically, this means that you will:
Write lots of Scala code
Test it using both example-based and property-based tests
Experience issues caused by blocking logic and concurrent execution
Work your way to efficient solutions in small and incremental steps
I will guide you through all the exercises and provide a complete set of solutions. My goal is to unlock your full potential as a functional Scala developer by demystifying complex concepts using explanations that are free of confusing jargon.
For those familiar with FP-Tower courses, this course corresponds to chapter 5 of Foundations of Functional Programming in Scala.
Enroll now, and enjoy the course.
What's inside
Syllabus
Getting Started
Setup the Scala project
SBT 101
Property-Based Testing tutorial
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Syllabus
Custom random generators
arbitrary lets us fetch the default random generator for a type, if there is one:
import org.scalacheck.Arbitrary.arbitrary
arbitrary[String]
// res: Gen[String] = ...
Then, we can use the methods filter or filterNot to modify an existing generator.
val invalidYesNoInputGen: Gen[String] = arbitrary[String].filter(word => word != "Y" && word != "N")
invalidYesNoInputGen is a random generator of String which will never produce the single letter String "Y" and "N".
Note that if the predicate of filter is too restrictive, it could take a long time for finding a valid value. For example, the code below generates a random Strings and discards all values that do NOT start with "abc".
arbitrary[String].filter(_.startsWith("abc"))
To prevent long or even infinite waiting time, Scalacheck throws an Exception if it discards too many values.
[Error] Gave up after 0 successful property evaluations. 51 evaluations were discarded.
If you want a generator of String starting with "abc", a better solution would be to generate a random String and then, prepend it with "abc".
arbitrary[String].map(randomString => "abc" ++ randomString)
Missing code
In the video, I mention a function called parseDate which is not included in the code.
def parseDate(line: String): LocalDate = LocalDate.parse(line, dateOfBirthFormatter)
We can also define a corresponding formatter function
def formatDateOfBirth(date: LocalDate): String = dateOfBirthFormatter.format(date)
References
Extension methods by Alvin Alexander https://alvinalexander.com/scala/implicit-extension-methods-functions-scala-2-3-dotty/
References
Fabio Labella — How do Fibers Work? https://www.youtube.com/watch?v=x5_MmZVLiSM
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Reviews summary
Practical scala concurrency with fp-tower
Demystifies difficult functional programming ideas.
Focuses on essential, modern Scala libraries.
Exercises are key to applying and reinforcing learning.
Activities
Review Functional Programming Concepts
Show steps
Solidify your understanding of functional programming principles before diving into Scala's implementation. This will make grasping the course material easier.
Browse courses on
Functional Programming
Show steps
-
Read introductory materials on functional programming.
-
Practice writing pure functions in a language you're familiar with.
-
Familiarize yourself with concepts like immutability and referential transparency.
Help Others in Online Forums
Show steps
Reinforce your understanding by helping other students in online forums. Explaining concepts to others is a great way to solidify your own knowledge.
Show steps
-
Find online forums related to Scala and functional programming.
-
Answer questions from other students.
-
Provide helpful and constructive feedback.
Read 'Functional Programming in Scala'
Show steps
Deepen your understanding of functional programming principles in Scala. This book is a great companion to the course.
View
Functional Programming in Scala, Second Edition
on Amazon
Show steps
-
Read the book alongside the course material.
-
Work through the exercises in the book.
-
Compare the book's approach to the course's approach.
Four other activities
Expand to see all activities and additional details
Show all seven activities
Implement Retry Logic
Show steps
Practice implementing different retry strategies using Scala's Future and IO monads. This will reinforce your understanding of error handling and concurrency.
Show steps
-
Implement a simple retry mechanism with a fixed delay.
-
Implement exponential backoff retry.
-
Implement retry with jitter.
-
Test your retry logic thoroughly.
Read 'Cats Effect with Scala.js'
Show steps
Explore Cats Effect in the context of Scala.js. This will broaden your understanding of its applications.
View
Putting Knowledge to Work
on Amazon
Show steps
-
Read the book and try out the examples.
-
Compare the book's approach to the course's approach.
-
Consider how you might apply these concepts in your own projects.
Build a Simple Rate Limiter
Show steps
Apply your knowledge of concurrent IO and error handling to build a practical rate limiter. This project will solidify your understanding of the course material.
Show steps
-
Design the rate limiter's API.
-
Implement the rate limiting logic using concurrent IO.
-
Test the rate limiter under different load conditions.
-
Document your code and design decisions.
Contribute to a Scala Library
Show steps
Contribute to an open-source Scala library that uses Future or IO. This will give you valuable experience working on a real-world project and collaborating with other developers.
Show steps
-
Find a Scala library that interests you.
-
Identify a bug or feature request to work on.
-
Submit a pull request with your changes.
-
Respond to feedback from the maintainers.
Review Functional Programming Concepts
Show steps
Solidify your understanding of functional programming principles before diving into Scala's implementation. This will make grasping the course material easier.
Browse courses on
Functional Programming
Show steps
- Read introductory materials on functional programming.
- Practice writing pure functions in a language you're familiar with.
- Familiarize yourself with concepts like immutability and referential transparency.
Help Others in Online Forums
Show steps
Reinforce your understanding by helping other students in online forums. Explaining concepts to others is a great way to solidify your own knowledge.
Show steps
- Find online forums related to Scala and functional programming.
- Answer questions from other students.
- Provide helpful and constructive feedback.
Read 'Functional Programming in Scala'
Show steps
Deepen your understanding of functional programming principles in Scala. This book is a great companion to the course.
View
Functional Programming in Scala, Second Edition
on Amazon
Show steps
- Read the book alongside the course material.
- Work through the exercises in the book.
- Compare the book's approach to the course's approach.
Implement Retry Logic
Show steps
Practice implementing different retry strategies using Scala's Future and IO monads. This will reinforce your understanding of error handling and concurrency.
Show steps
- Implement a simple retry mechanism with a fixed delay.
- Implement exponential backoff retry.
- Implement retry with jitter.
- Test your retry logic thoroughly.
Read 'Cats Effect with Scala.js'
Show steps
Explore Cats Effect in the context of Scala.js. This will broaden your understanding of its applications.
View
Putting Knowledge to Work
on Amazon
Show steps
- Read the book and try out the examples.
- Compare the book's approach to the course's approach.
- Consider how you might apply these concepts in your own projects.
Build a Simple Rate Limiter
Show steps
Apply your knowledge of concurrent IO and error handling to build a practical rate limiter. This project will solidify your understanding of the course material.
Show steps
- Design the rate limiter's API.
- Implement the rate limiting logic using concurrent IO.
- Test the rate limiter under different load conditions.
- Document your code and design decisions.
Contribute to a Scala Library
Show steps
Contribute to an open-source Scala library that uses Future or IO. This will give you valuable experience working on a real-world project and collaborating with other developers.
Show steps
- Find a Scala library that interests you.
- Identify a bug or feature request to work on.
- Submit a pull request with your changes.
- Respond to feedback from the maintainers.
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