Book #15 - Programming in Scala

Programming in Scala, 5th edition
by Martin Odersky, Lex Spoon, Bill Venners, and Frank Sommers (2021) - PrePrint edition

Monday evenings - 7:10 pm pacific time

Meetup: https://www.meetup.com/Los-Gatos-Rust-Reading-Group/events/281371456
Zoom: https://us02web.zoom.us/j/84281187589
Artima: https://www.artima.com/shop/programming_in_scala_5ed
Source code (zip): https://booksites.artima.com/programming_in_scala_5ed/progInScalaExamples5Ed.zip

Notes: Scala 3

Note: On October 18, we plan to discuss whether or not we need to cover Chapter 24, per Patrick’s comment. It may be too much like a reference, not allowing for any meaty discussion. Let’s discuss

October 18 - I'm officially declaring the book DONE! We all did the first 23 chapters of 25, where the real meat was. The last two are a bit thin, or at least that seems to be the consensus here. Next book - “Functional Programming in Scala” (2nd edition)

Chapter 23 Typeclasses October 11, 2021	Presenter

Chapter 23 Typeclasses October 11, 2021	Presenter
Why typeclasses?	Casey
Context bounds	Patrick
Main methods	Karthik
Multiversal equality	Casey
Implicit conversions	Amish
Typeclass case study: JSON serialization	Amish - October 18

Chapter 22 Extension Methods September 27, 2021 October 4, 2021	Presenter

Chapter 22 Extension Methods September 27, 2021 October 4, 2021	Presenter
The basics	Karthik
Generic extensions	Amish
Collective extensions	Amish - October 4
Using a typeclass	Casey - October 4
Extension methods for givens	Casey - October 4
Where Scala looks for extension methods	Karthik - October 4

Chapter 21 Givens September 20, 2021	Presenter

Chapter 21 Givens September 20, 2021	Presenter
How it works	Patrick
Parameterized given types	Patrick
Anonymous givens	Casey
Parameterized givens as typeclasses	Casey
Given imports	Karthik - September 27
Rules for context parameters	Casey - September 27
When multiple givens apply	Amish - September 27
Debugging givens	Amish - September 27

Chapter 20 Abstract Members August 30, 2021	Presenters

Chapter 20 Abstract Members August 30, 2021	Presenters
A quick tour of abstract members Type members Abstract vals Abstract vars	Casey
Initializing abstract vals	Casey
Abstract types	Patrick - September 13
Path-dependent types Refinement types	Casey - September 13
Case study: Currencies	Amish - September 13

Chapter 19 Enums August 23, 2021

Chapter 19 Enums August 23, 2021
Enumerated data types	Patrick
Algebraic data types	Amish - August 30
Generalized ADTs	Casey - August 30
What makes ADTs algebraic	Vlad - August 30

Chapter 18 Type Parameterization August 16, 2021	Presenter

Chapter 18 Type Parameterization August 16, 2021	Presenter
Functional queues	Amish
Information hiding	Amish
Variance annotations	Vlad
Checking variance annotations	Vlad
Lower bounds	Casey
Contravariance	Casey - August 30
Upper bounds	Karthik - August 23

Chapter 17 Scala’s Hierarchy August 9, 2021	Presenter

Chapter 17 Scala’s Hierarchy August 9, 2021	Presenter
Scala’s class hierarchy	Amish
How primitives are implemented	Amish
Bottom types	Vlad
Defining your own value classes	Vlad
Intersection types	Karthik
Union types	Casey
Transparent traits	Patrick

Chapter 16 Mutable Objects August 2, 2021	Presenter

Chapter 16 Mutable Objects August 2, 2021	Presenter
What makes an object mutable?	Karthik
Reassignable variables and properties	Amish
Case study: Discrete event simulation	Amish
A language for digital circuits	Casey
The Simulation API	Casey
Circuit Simulation	Casey

Chapter 15 Working with Other Collections July 26, 2021	Presenter

Chapter 15 Working with Other Collections July 26, 2021	Presenter
15.1 Sequences	Casey
15.2 Sets and Maps	Karthik
15.3 Selecting mutable versus immutable collections	Karthik - August 2
15.4 Initializing collections	Amish - August 2
15.5 Tuples	Amish - August 2

Chapter 14 Working with Lists July 19, 2021	Presenter

Chapter 14 Working with Lists July 19, 2021	Presenter
List literals	jonnie
The List type	jonnie
Constructing lists	jonnie
Basic operations on lists	Patrick
List patterns	Patrick
First-order methods on class List	Casey
Higher-order methods on class List	Casey
Methods of the List object	Amish - July 26
Processing multiple lists together	Amish - July 26
Understanding Scala’s type inference algorithm	Casey - July 26

Chapter 13 Pattern Matching July 12, 2021	Presenter

Chapter 13 Pattern Matching July 12, 2021	Presenter
A simple example	Casey
Kinds of patterns	Casey
Pattern guards	Karthik
Pattern overlaps	Karthik
Sealed classes	Vlad
Pattern matching Options	Vlad
Patterns everywhere	Amish
A larger example	Amish

Chapter 12 Packages, Imports, and Exports June 14, 2021	Presenter

Chapter 12 Packages, Imports, and Exports June 14, 2021	Presenter
Putting code in packages	jonnie
Concise access to related code	jonnie
Imports	Casey
Implicit imports	Casey
Access modifiers	Amish
Top-level definitions	Karthik
Exports	Karthik

Chapter 11 Traits June 7, 2021	Presenter

Chapter 11 Traits June 7, 2021	Presenter
How traits work	jonnie
Thin versus rich interfaces	Karthik
Traits as stackable modifications	Casey
Why not multiple inheritance?	vlad
Trait parameters	vlad

Chapter 10 Composition and Inheritance May 31, 2021	Presenter

Chapter 10 Composition and Inheritance May 31, 2021	Presenter
A two-dimensional layout library	John
Abstract classes	John
Defining parameterless methods	John
Extending classes	Casey
Overriding methods and fields	Casey
Defining parametric fields	Casey
Invoking superclass constructors	Casey
Using override modifiers	Casey
Polymorphism and dynamic binding	Karthik
Declaring final members	Karthik
Using composition and inheritance	Karthik
Implementing above, beside, and toString	Casey
Defining a factory object	Vlad
Heighten and widen	Vlad
Putting it all together	Vlad

Chapter 9 Control Abstraction May 3-10, 2021	Presenter

Chapter 9 Control Abstraction May 3-10, 2021	Presenter
Reducing code duplication	Amish
Simplifying client code	Casey
Currying	Amish
Writing new control structures	Casey
By-name parameters	Casey

Chapter 8 Functions and Closures May 3, 2021	Presenter

Chapter 8 Functions and Closures May 3, 2021	Presenter
Methods	John
Local functions	John
First-class functions	Casey
Short forms of function literals	Casey
Placeholder syntax	Casey
Partially applied functions	Amish
Closures	Amish
Special function call forms	Vlad
Tail recursion	Vlad

Chapter 7 Built-in Control Structures April 19, 2021	Presenter

Chapter 7 Built-in Control Structures April 19, 2021	Presenter
If expressions	John
While loops	John
For expressions	Vlad
Exception handling with try expressions	Amish
Match expressions	Vlad
Living without break and continue	Amish
Variable scope	Amish
Refactoring imperative-style code	Vlad

Chapter 6 Functional Objects April 12, 2021	Presenter

Chapter 6 Functional Objects April 12, 2021	Presenter
A specification for class Rational	Karthik
Constructing a Rational	Karthik
Reimplementing the toString method	Karthik
Checking preconditions	Amish
Adding fields	Amish
Self references	Amish
Auxiliary constructors	Casey
Private fields and methods	Casey
Defining operators	Casey
Identifiers in Scala	Vlad
Method overloading	Vlad
Extension methods	Vlad
A word of caution	Vlad

Chapter 5 Basic Types and Operations April 5, 2021	Presenter

Chapter 5 Basic Types and Operations April 5, 2021	Presenter
Some basic types	Amish
Literals	Amish
String interpolation	Amish
Operators are methods	Amish
Arithmetic operations	Amish
Relational and logical operations	Vlad
Bitwise operations	Vlad
Object equality	Vlad
Operator precedence and associativity	Vlad
Rich operations	Vlad

Chapter 4 Classes and Objects April 5, 2021	Presenter

Chapter 4 Classes and Objects April 5, 2021	Presenter
Classes, fields, and methods	Casey
Semicolon inference	Casey
Singleton objects	Casey
Case classes	Casey
A Scala application	Casey

Chapter 3 Next Steps in Scala March 29, 2021	Presenter

Chapter 3 Next Steps in Scala March 29, 2021	Presenter
Parameterize arrays with types	Casey
Use lists	Casey
Use tuples	Casey
Use sets and maps	Amish
Learn to recognize the functional style	Amish
Transform with map and for-yield	Amish

Chapter 2 First Steps in Scala March 29, 2021	Presenter

Chapter 2 First Steps in Scala March 29, 2021	Presenter
Learn to use the Scala REPL	Vlad
Define some variables	Vlad
Define some functions	Vlad
Write some Scala scripts	Vlad
Loop with while; decide with if	Vlad
Iterate with foreach and for-do	Vlad

Chapter 1 A Scalable Language March 22, 2021	Presenter

Chapter 1 A Scalable Language March 22, 2021	Presenter
1.1 A language that grows on you	Casey
1.2 What makes Scala scalable	Amish
1.3 Why Scala?	Vlad
1.4 Scala’s roots	Casey