Easy and Efficient Data Validation with Cats

on YouTube ↗34m

" summary

Compares Option and Either (Scala 2.11/2.12) to Cats’ Validated and shows using ValidatedNel to run validations in parallel and return every failure instead of failing fast; demonstrates concrete functions validateEmail/validatePhone, builds a Validation type alias and an Error case class, wires a companion object with an accumulate errors helper, maps error lists to HTTP status codes, and shows runnable example code that composes, returns structured errors, and works as intended.

AI-written summary · about

" chapters (13)

1. 0:00Start
2. 2:23DATA VALIDATION
3. 5:34FOR-COMPREHENSION
4. 6:25CASE STUDY
5. 7:28OPTION
6. 18:36EITHER (2.12)
7. 19:56BIASED EITHER WITH 2.11
8. 22:29VALIDATED AND APPLY
9. 26:24USE AN EXPRESSIVE ERROR TYPE
10. 27:16OUR FINAL SOLUTION
11. 28:55STEP 3
12. 30:37A CONCRETE EXAMPLE
13. 32:31SUMMARY

" related talks

• 39mFunctional Error Handling with CatsMark Canlas · Typelevel Summit 2020
• 46mOptimusPrimeTLars Hupel · Lambda World 2015
• 31mCool toolz in the Scalaz and Cats toolboxesJan Pustelnik · Scalar 2016
• 36mKittens - datatype-generic functional programming with ScalaKailuo Wang · Strange Loop 2016
• 28mTAMING YOUR HERD OF CATSMikołaj Koziarkiewicz · Scalar 2019
• 15mEvaluation in Cats: the Good, the Bad, and the LazyErik Osheim · Typelevel Summit Philadelphia 2016
• 16mGetting started with EitherTJulie Laver · Scale By The Bay 2018
• 38mThinking Less with ScalaDaniel Sivan · Scalapeño 2018