47 Degrees joins forces with Xebia read more

Functional Error Handling and Validation with Cats


Functional Error Handling and Validation with Cats

There is a place where all the fancy abstractions of functional programming really shine: error handling and data validation. During this talk, we will take a whirlwind tour of what the Scala language, supplemented by the cats library, have to offer in that respect:

  • Option and Either to expressively represent computation that may fail.
  • Validated for checking pre-conditions on our programs’ inputs while nicely accumulating all encountered errors.
  • Then we will see how the “three musketeers of functional programming,” Applicative, Monad and Traverse (along with Functor as d’Artagnan) can help us handle our errors and validate our data in a simple, expressive, and composable way!

If you have questions after watching this talk, you can head over to the Academy Slack Scala Channel to discuss!

This event has endedView upcoming events

Company and Private Group Training


Valentin Kasas

Valentin Kasas

Senior Software Engineer


  • Scala
  • Cats
  • Functional Programming

This Talk includes:

  • Q&A Session
  • Access to Slides
  • Access to Academy Slack


  • Familiarity with the Scala language

Upcoming Academy Events

Frequently Asked Questions

Is this course 100% online?


How do I register interest for a course with no start date or future training dates?

You can join the Academy newsletter to stay posted about upcoming courses and events.

What if I can’t find a course?

Please email your thoughts and suggestions to [email protected], and we’ll get back to you as soon as possible.

Will I receive accreditation for a course?

For any paid training courses, we intend to launch an accreditation process after the launch of Academy. If you take a paid training course before this time, we’ll make sure to send an accreditation when we’re ready.

What tools do I need to access 47 Degrees Academy content?

The only thing you need is a modern web browser and Internet connection. For training courses with code workshops or downloadable code samples, the course specifics will include the necessary tools and instructions to get going.

Will I earn university credit for completing any training?

No, at this time, the courses are not intended to replace university or other formal education courses. If you are an academic or training institution with an interest in partnering or licensing content from Academy, please get in touch at [email protected].

What languages will the training be given in?

English is the common language across 47 Degrees. If you have an interest in supporting other languages, please let us know at [email protected].

Is financial aid available for underrepresented or low-income groups?

Our industry is not diverse enough across many measures of representation. Nor is it easily accessible to many minorities or those in low-income scenarios. If you feel that you belong to an underrepresented minority or need help financially, please fill this form. We can apply a course voucher to your registered Academy account. The voucher can be redeemed against any paid course on a one-time basis. The voucher is non-transferable, non-refundable, and has no financial value.

What is the refund policy?

If you request a refund for a paid training course before taking it, we will refund your course fee during our next processing cycle. If you request a refund for a paid training course after starting or accessing it, please email us at [email protected]. Please refer to the full Terms and Conditions before requesting a refund. 47 Degrees reserves the right to refuse refunds.

Are these courses qualified for the FUNDAE (Fundación Tripartita)?

Part of the course cost is reimbursable for companies located in Spain, through Fundae ( formerly, Fundación Tripartita ). If this is your case, please contact us through [email protected] before enrolling in a course.

Do you have more questions? Contact us