Scala Katas

Here is the list of the available Scala Katas

Introduction to functional programming with Scala

• Level: Beginner
• Directory: intro-fp
• Presentation: slides

Content

• Immutability
• Functions and recursion
• Basic usage of immutable Lists (construction, pattern matching)

map/flatMap and for comprehension

• Level: Beginner
• Directory: flatMap
• Presentation: slides

Content

• Monads
• map, flatMap
• relationship between for comprehension and map/flatMap
• Examples: Lists, Option and Futures

Scala 2 'implicits' vs Scala 3 'given' and 'using'

• Level: Intermediate
• Directory: implicits-and-given
• Presentation: slides

Content

• Scala 2 implicits
• Scala 3 'using' and 'given'
• Scala 3 'extension'

Monocle

• Level: Intermediate
• Directory: monocle
• Presentation: slides

Content

• Case classes
• Use Monocle to avoid boilerplate code when updating one Case class field in a tree-like structure

The type class pattern

• Level: Intermediate/Advanced
• Directory: typeclass-pattern
• Presentation: slides

Content

• Presentation of the 'type class' pattern
• Implement a 'CartesianProduct' typeclass

map and contramap

• Level: Intermediate/Advanced
• Directory: map-contramap
• Presentation: slides

Content

• Variance
• map and the Functor type class
• contramap and the Contravariant type class

Introduction to IOs

• Level: Advanced
• Directory: IntroToIOs
• Presentation:
  • slides part 1
  • slides part 2

Content

• Rules of functional programming
• Effect types
• The Cats effect IO type
• Fibers
• Parallelization

FS2

• Level: Advanced
• Directory: fs2
• Presentation:
  • slides part 1
  • slides part 2

Content

• Streaming files with fs2
• Streaming a Kafka topic with fs2
• Parallelization
• Fs2 pipes

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