The document discusses Scala type classes, highlighting their advantages over traditional polymorphism, such as flexibility and the ability to add behaviors without modifying existing types. It outlines the key components of type classes, including traits, instances, and implicit mechanisms that enhance code readability and extensibility. Additionally, it emphasizes etiquette for sessions, including punctuality and constructive feedback.

1. Scala Type Classes
Prateek Gupta

2. Agenda
1. Problem with Normal Polymorphism
2. Introduction to Scala Type Classes
3. Components of a Type Class
 Type Class trait
 Type Class Instances
 Implicit Type Class Instances
4. Ad Hoc Polymorphism
5. Enrich Types with Implicit Class Conversion

3. KnolX Etiquettes
Lack of etiquette and manners is a huge turn off.
 Punctuality
Join the session5 minutes prior to the sessionstart time. We start on
time and conclude on time!
 Feedback
Make sure to submit a constructive feedbackfor all sessions as it is very
helpful for the presenter.
 Silent Mode
Keep your mobile devices in silent mode,feel free to move out of session
in case you need to attend an urgent call.
 Avoid Disturbance
Avoid unwanted chit chat during the session.

4. Problem with Norma
Polymorphism

5. Problem with Normal Polymorphism
 Traditional polymorphism has limitations:
– Requires inheritance or modifying existing types.
– Difficulty when adding new behaviors to existing types.
 Real-world scenario:
– Adding new serialization formats to existing types.
 Type classes offer a flexible alternative.

6. ntroduction to
Scala Type Classes

7. Scala Type Classes
 Scala Type classes enable developers to define behaviors independently of types.
 They allow us to write generic code that operates on a wide range of types.
 They enable adding functionality to types without modifying their code.
 Promote code separation and extensibility.

8. Components of a Type Class

9. Components of a Type Class
 Type class trait with abstract methods.
 Instances for different types.
 Implicit resolution mechanism.

10. Type Class trait
 A type class is represented by a parameterized trait that defines a set of operations.
 The trait itself does not provide any implementations.

11. Type Class Instances
 Type class instances provide the implementations of the behaviors specified by
the type class trait.
 These instances are created for specific types and define how the behavior works for
those types.

12. Implicit Type Class Instances
 Scala Type classes make use of implicits.
 Implicit type class instances are automatically passed as parameters when needed.
 Enables the compiler to find appropriate instances based on type involved.
 Simplifies the process of using type classes.
 Enhances code readability.

13. Ad Hoc Polymorphism
 Type classes enable ad hoc polymorphism.
 Flexible Behavior for the same or across different types.
 Ideal for extending third-party or built-in types.

14. Enrich Types with Implicit Class Conversion
 Implicit class conversion adds new methods to types.
 Extends the functionality of existing types.
 Utilize custom methods on types enriched with implicit classes:
 Enriched types make code more expressive and maintainable.

15. Recap

16. Thank you