Scala Tutorials

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OUR ONLINE TUTORIALS:

Scala Introduction: A general overview of Scala
Chapter 2: Learning Scala basic foundation
Chapter 4: Object Oriented using classes
Chapter 6: Immutable Collection
Chapter 8: Collection Functions
Chapter 10: ScalaTest and Cheatsheet
Chapter 12: Learn Apache Spark 2
Chapter 14: Learn Apache Cassandra
Chapter 16: Data Science & Machine Learning
Chapter 1: Getting familiar with IntelliJ IDEA
Chapter 3: Thinking in terms of functions
Chapter 5: Traits and Dependency Injection
Chapter 7: Mutable Collection
Chapter 9: Futures
Chapter 11: Learn SBT
Chapter 13: Learn Akka
Chapter 15: Scala Exercises

 

 

     Scala Introduction

    A general overview of Scala

  1. Introduction
  2. What is Scala programming language
  3. Scala functional programming features and more!
  4. Why should you learn Scala?

     Chapter 1

    Getting familiar with IntelliJ IDEA

  1. Introduction
  2. Scala Environment Setup - Install Open Java Development Kit (OpenJDK)
  3. Scala Environment Setup – Install Java Development Kit (JDK)
  4. Scala Environment Setup – How to install the IntelliJ IDE
  5. Scala Environment Setup - Install IntelliJ IDEA Version 2019
  6. Scala Environment Setup – How to install Scala plugin in IntelliJ
  7. Scala Environment Setup - How to install the Scala plugin in IntelliJ version 2019
  8. Your first Scala Hello World application
  9. Launch Scala application from main method
  10. Running Your Scala application
  11. Debugging Your Scala Application
  12. Getting Started With Scala Project
  13. Scala Project Classpath
  14.  Getting Started With build.sbt
  15. SBT Dependencies And Maven
  16. Real-world build.sbt
  17. IntelliJ Settings and Preferences
  18. IntelliJ Navigation Keyboard Shortcuts
  19. IntelliJ Search Keyboard Shortcuts
  20. IntelliJ Keyboard Shortcuts – Compile, Debug, Run

     Chapter 2

    Learning Scala: Fundamentals

  1. Introduction
  2. Variables And Types
  3. String Interpolation
  4. How To Escape Characters And Create Multi-line String
  5. Type Inference
  6. If Else Statement And Expression
  7. For Comprehension
  8. Range
  9. While And Do While Loop
  10. Pattern Matching
  11. Tuples
  12. Option
  13. Class And Type Hierarchy
  14. Enumerations
  15. Enum And Algebraic Data Types

     Chapter 3

    Thinking in terms of functions

  1. Introduction
  2. Functions
  3. Function With Parameters
  4. Function With Option Parameters
  5. Function With Option Return Type
  6. Function With Implicit Parameter
  7. Implicit Function
  8. Typed Function
  9. Polymorphic Function With Generic Return Type
  10. Variable Argument Function
  11. Functions As Symbols
  12. Function Currying With Parameter Groups
  13. Higher Order Function
  14. Higher Order Function - Call By Name Function
  15. Higher Order Function - With Callback Parameter
  16. Function Using The Val Keyword Instead Of Def
  17. Function Composition Using AndThen
  18. Function Composition Using Compose
  19. Tail Recursive Function - @annotation.tailrec
  20. Tail Recursive Function - scala.util.control.TailCalls._
  21. Trampoline Tail Recursive Function Using scala.util.control.TailCalls._
  22. Partial Function Using the PartialFunction Trait
  23. Nested Function

     Chapter 4

    Object Oriented using classes

  1. Introduction
  2. Classes And Objects
  3. Companion Objects
  4. Companion Objects' Apply Method As A Factory (Class Hierarchy Via Inheritance)
  5. Values And Fields In Companion Object
  6. Singleton Object
  7. Case Class
  8. Type Alias: Type Aliasing Versus Case Class
  9. Implicit Class - Extension Methods
  10. Package Objects
  11. Extend Abstract Class
  12. Case Class Inheritance
  13. Typed Class
  14. Covariance
  15. Contra-Variance

 Chapter 5

Traits and Dependency Injection

1. Introduction

2. Create And Extend Trait

3. Trait With Type Parameters

4. Extend Multiple Traits

5. Dependency Injection Using Traits: Part 1

6. Dependency Injection Using Traits: Part 2 Avoid Cake Pattern

7. Traits, Companion Objects, Factory Pattern

8. Type Class For Ad-hoc Polymorphism

9. Trait Mixin And Linearization

10. The Magnet Pattern

11. The Functor Trait Challenge From The Cats Library

     Chapter 6

    Immutable Collection

  1. Introduction
  2. Data Structures
  3. List
  4. ListSet
  5. ListMap
  6. Map
  7. HashMap
  8. TreeMap
  9. Queue
  10. Sequence
  11. Set
  12. HashSet
  13. TreeSet
  14. SortedSet
  15. BitSet
  16. Stack
  17. Stream
  18. Vector

     Chapter 7

    Mutable Collection

  1. Introduction
  2. Array
  3. ArrayBuffer
  4. ArrayStack
  5. ListBuffer
  6. Map
  7. HashMap
  8. ListMap
  9. LinkedHashMap
  10. Queue
  11. PriorityQueue
  12. Set
  13. HashSet
  14. SortedSet
  15. TreeSet
  16. LinkedHashSet
  17. BitSet



     Chapter 8

    Collection Functions

Function: aggregate Function: collect
Function: diff Function: drop
Function: dropWhile Function: exists
Function: filter & filterNot Function: find
Function: flatMap Function: flatten
Function: fold Function: foldLeft
Function: foldRight Function: foreach
Function: groupBy Function: head
Function: isEmpty Function: intersect
Function: last Function: map
Function: max Function: maxBy
Function: min Function: minBy
 Function: mkString Function:nonEmpty
Function: par Function: partition
Function: reduce Function: reduceLeft
Function: reduceRight Function: reverse
Function: reverseIterator Function: scan
Function: scanLeft Function: scanRight
Function: size Function: slice
Function: sortBy Function: sorted
Function: sortWith Function: tail
Function: take Function: takeRight
Function: takeWhile Function: transpose
Function: union Function: unzip
Function: unzip3 Function: view
Function: withFilter Function: zip
Function: zipWithIndex  Function: par for Scala 2.13.0 and above

Chapter 9

Futures

  1. Introduction
  2. Method with future as return type
  3. Non blocking future result
  4. Chain futures using flatMap()
  5. Chain futures using for comprehension
  6. Future Option with for comprehension
  7. Future Option with map
  8. Composing Futures
  9. Future Sequence
  10. Future Traverse
  11. Future foldLeft
  12. Future reduceLeft
  13. Future firstCompletedOf
  14. Future zip
  15. Future zipWith
  16. Future andThen
  17. Future configure threadpool
  18. Future recover
  19. Future recoverWith
  20. Future fallbackTo
  21. Future promise

 

     Chapter 10

    Scala Test and Cheatsheet

     ScalaTest:

  1. Introduction
  2. Add ScalaTest as dependency to build.sbt
  3. Create a test class using FlatSpec and Matchers
  4. Equality Test
  5. Length Test
  6. Boolean Test
  7. Collection Test
  8. Type Test
  9. Exception Test
  10. Private Method Test
  11. Future Method Test

     Collection:

  1. Convert Java collection     

     General:

  1. Add line break
  2. Convert multi-line string to single line
  3. Check value of an Option
  4. Read file content as a String
  5. Create enum using sealed trait
  6. Int division and return float     

     Futures:

  1. Cannot find an implicit ExecutionContext

     Chapter 11

    Learn SBT

     Install SBT:

  1. Install SBT on Windows
  2. Install SBT on Mac

     sbt run:

  1. Run a Scala main class

     sbt test:

  1. Run all tests
  2. Run only one specific test
  3. Run all integration tests
  4. Run a specific integration test
  5. Run one method in a test class

     sbt debugging:

  1. Analyze stacktrace in IntelliJ

     sbt resources:

  1. Show unmanaged classpaths
  2. Show unmanaged resources

     Chapter 12 - Part 1

    Learn Apache Spark 2

     Project Setup:

  1. Using StackOverflow dataset
  2. Add Apache Spark 2 SBT dependencies
  3. Bootstrap a SparkSession

     DataFrame SQL Query:

  1. DataFrame Introduction
  2. Create DataFrame from a CSV file
  3. DataFrame schema
  4. Select columns
  5. Filter by column value
  6. Count rows
  7. SQL like
  8. Filter chaining
  9. SQL In
  10. SQL Group By
  11. SQL Group By with filter
  12. SQL order by
  13. Cast column data type
  14. Filtered dataframe
  15. Dataframe Join
  16. Join and select columns
  17. Join on explicit columns
  18. Inner Join
  19. Left Outer Join
  20. Right Outer Join
  21. Distinct

     Chapter 12 - Part 2

    Learn Apache Spark 2

     Spark SQL:

  1. Spark SQL Introduction
  2. Register temporary table
  3. List all tables in Spark's catalog
  4. List catalog tables using Spark SQL
  5. Select columns
  6. Filter by column value
  7. Count number of rows
  8. SQL like
  9. SQL where with and clause
  10. SQL In clause
  11. SQL Group by
  12. SQL Group by with having clause
  13. SQL Order by
  14. Typed columns, filter and create temp table
  15. SQL Inner join
  16. SQL Left outer join
  17. SQL Right outer join
  18. SQL Distinct
  19. Register User Defined Function (UDF)



     Chapter 12 - Part 3

    Learn Apache Spark 2

     DataFrame Statistics:

  1. DataFrame Statistics Introduction
  2. Create DataFrame from CSV
  3. Average
  4. Maximum
  5. Minimum
  6. Mean
  7. Sum
  8. Group by query with statistics
  9. DataFrame Statistics using describe()
  10. Correlation
  11. Covariance
  12. Frequent Items
  13. Crosstab
  14. Stratified sampling using sampleBy()
  15. Approximate Quantile
  16. Bloom Filter
  17. Count Min Sketch
  18. Sampling With Replacement



     Chapter 12 - Part 4

    Learn Apache Spark 2

     DataFrame Operations:

  1. DataFrame Operations Introduction
  2. Setup DataFrames
  3. Convert DataFrame row to Scala Case class
  4. Convert DataFrame row to Scala Case class using map() method
  5. Create DataFrame from Collection
  6. DataFrame Union
  7. DataFrame Intersection
  8. Append column to DataFrame using withColumn() method

     Chapter 13 - Part 2

    Learn Akka

     Akka Actors & ActorSystems:

     Akka Routers:

  1. RoundRobinPool
  2. ScatterGatherFirstCompletedPool
  3. TailChoppingPool
  4. BroadcastPool

     Akka Dispatchers:

  1. Akka Default Dispatcher
  2. Akka Lookup Dispatcher
  3. Fixed Thread Pool Dispatcher
  4. Resizable Thread Pool Dispatcher
  5. Pinned Thread Pool Dispatcher

    Akka FSM:

  1. Actor FSM become()
  2. Actor FSM unbecome()
  3. Actor FSM protocol
  4. Actor LoggingFSM
  5. Actor LoggingFSM Part Two
  6. Actor LoggingFSM Part Three
  7. Actor LoggingFSM Part Four
  8. Actor LoggingFSM Part Five
  9. Actor LoggingFSM Part Six
  10. Actor FSM Scheduler

     Akka TestKit:

  1. Testing Actor FSM
  2. Testing Actor
  3. Testing Akka HTTP POST
  4. Testing Query Parameter
  5. Testing Required Query Parameter
  6. Testing Optional Query Parameter
  7. Testing Typed Query Parameter
  8. Testing CSV Query Parameter

     Chapter 16

    Data Science & Machine Learning

  1.  Natural Language Processing (NL) and Machine Learning using Apache Spark: Covid-19 versus The Avengers

     Chapter 12 - Part 5

    Learn Apache Spark 2

     Spark Functions:

     Chapter 13 - Part 3

    Learn Akka

     Akka HTTP:

  1. Akka HTTP project setup build.sbt
  2. Start Akka HTTP server
  3. HTTP GET plain text
  4. HTTP GET JSON response
  5. JSON encoding
  6. JSON pretty print
  7. HTTP POST JSON payload
  8. Could not find implicit value
  9. HTTP DELETE restriction
  10. Future onSuccess
  11. Future onComplete
  12. Complete with an HttpResponse
  13. Try failure using an HttpResponse
  14. Global rejection handler
  15. Global exception handler
  16. Load HTML from resources
  17. RESTful URLs with segment
  18. RESTful URLS with regex
  19. RESTful URLs multiple segments
  20. Query Parameter
  21. Optional query parameter
  22. Typed query parameters
  23. CSV query parameter
  24. Query parameter to case class
  25. Http request headers
  26. Http client GET
  27. Unmarshal HttpResponse to case class
  28. Http client POST JSON
  29. Akka HTTP CRUD project
  30. Akka HTTP CRUD project - part 2
  31. Akka HTTP CRUD project - part 3

     Chapter 13 - Part 1

    Learn Akka

     Akka Actors & ActorSystems:

     Introduction

  1. What is Akka
  2. Project setup build.sbt

     Akka Actors:

  1. Actor System Introduction
  2. Tell Pattern
  3. Ask Pattern
  4. Ask Pattern mapTo
  5. Ask Pattern pipeTo
  6. Actor Hierarchy
  7. Actor Lookup
  8. Child Actors
  9. Actor Lifecycle
  10. Actor PoisonPill
  11. Error Kernel Supervision

 

     Chapter 14

    Learn Apache Cassandra

     Introduction:

  1. What is Apache Cassandra
  2. Install Apache Cassandra
  3. Using nodetool
  4. cassandra.yaml
  5. cqlsh
  6. Load CQL statements from file
  7. Partition keys
  8. Clustering keys
  9. Cassandra CQL is not SQL!
  10. Multiple clustering keys
  11. Clustering keys restrictions
  12. Secondary index
  13. Create materialized view

     Chapter 15

    Scala Exercises With Solutions

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Nadim Bahadoor
Technology and Finance Consultant with over 14 years of hands-on experience building large scale systems in the Financial (Electronic Trading Platforms), Risk, Insurance and Life Science sectors. I am self-driven and passionate about Finance, Distributed Systems, Functional Programming, Big Data, Semantic Data (Graph) and Machine Learning.