Source Code For Scala Tutorials From www.allaboutscala.com

Introduction

The Scala programming language is rapidly growing in popularity! Sadly, most of the online tutorials do not provide a step-by-step guide :(

At www.allaboutscala.com, we provide a complete beginner's tutorial to help you learn Scala in small, simple and easy steps.

• Tutorials are organized such that they allow you to learn gradually.
• Tutorials are written by taking into account the complete beginner.
• Tutorials will make you proficient with the same professional tools used by the Scala experts.

The Tutorials

Scala Introduction: A general overview of Scala

• 1: Introduction
• 2: What is Scala programming language
• 3: Scala functional programming features and more!

Chapter 1: Getting familiar with the IntelliJ IDEA

• 1: Introduction
• 2: Scala Environment Setup – Install Java Development Kit (JDK)
• 3: Scala Environment Setup – How to install the IntelliJ IDE
• 4: Scala Environment Setup – How to install Scala plugin in IntelliJ
• 5: Scala Tutorial – Your first Scala Hello World application
• 6: Where is the main method to launch Scala application
• 7: IntelliJ Run Configuration – Running Your Scala application
• 8: IntelliJ Debug Configuration – Debugging Your Scala Application
• 9: IntelliJ Project Structure – Getting Started With Scala Project
• 10: IntelliJ Project Structure – Scala Project Classpath
• 11: IntelliJ Import Dependencies – Getting Started With build.sbt
• 12: IntelliJ Import Dependencies – SBT Dependencies And Maven
• 13: IntelliJ Manage Configurations – Settings, Preferences
• 14: IntelliJ Keyboard Shortcuts – Navigation Shortcuts
• 15: IntelliJ Keyboard Shortcuts – Search Shortcuts
• 16: IntelliJ Keyboard Shortcuts – Compile, Debug, Run

Chapter 2: Learning the basic foundation of Scala

• 1: Introduction
• 2: Scala Basic Tutorial – How To Declare Variables And Types
• 3: Scala String Interpolation – Print And Format Variables
• 4: Scala – How To Escape Characters And Create Multi-line String
• 5: An Overview Of Scala Type Inference
• 6: How To Use If Else Statement And Expression
• 7: Learn How To Use For Comprehension
• 8: Learn How To Use Range
• 9: Learn How To Use While And Do While Loop
• 10: Learn How To Use Pattern Matching
• 11: Learn How To Use Tuples
• 12: Learn How To Use Option – Avoid Null
• 13: Learn The Scala Class And Type Hierarchy
• 14: Learn How To Create And Use Enumerations

Chapter 3: Thinking In Terms Of Functions

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

Chapter 4: Think you know Object Oriented using classes?

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

Chapter 5: Dependency Injection reinvented using traits

• 1: Introduction
• 2: Learn How To Create And Extend Trait In Scala
• 3: Learn How To Create Trait With Type Parameters
• 4: Learn How To Extend Multiple Traits
• 5: Learn How To Use Traits For Dependency Injection
• 6: Learn How To Use Traits For Dependency Injection Part 2 - Avoid Cake Pattern
• 7: Traits, Companion Object, Factory Pattern

Chapter 6: Immutable Collection

• 1: Introduction
• 2: Learn How To Use Scala's Immutable List
• 3: Learn How To Use Scala's Immutable ListSet
• 4: Learn How To Use Scala's Immutable ListMap
• 5: Learn How To Use Scala's Immutable Map
• 6: Learn How To Use Scala's Immutable HashMap
• 7: Learn How To Use Scala's Immutable TreeMap
• 8: Learn How To Use Scala's Immutable Queue
• 9: Learn How To Use Scala's Immutable Sequence
• 10: Learn How To Use Scala's Immutable Set
• 11: Learn How To Use Scala's Immutable HashSet
• 12: Learn How To Use Scala's Immutable TreeSet
• 13: Learn How To Use Scala’s Immutable SortedSet
• 14: Learn How To Use Scala's Immutable BitSet
• 15: Learn How To Use Scala's Immutable Stack
• 16: Learn How To Use Scala's Immutable Stream
• 17: Learn How To Use Scala's Immutable Vector

Chapter 7: Mutable Collection

• 1: Introduction
• 2: Learn How To Use Scala's Mutable Array
• 3: Learn How To Use Scala's Mutable ArrayBuffer
• 4: Learn How To Use Scala's Mutable ArrayStack
• 5: Learn How To Use Scala's Mutable ListBuffer
• 6: Learn How To Use Scala's Mutable Map
• 7: Learn How To Use Scala's Mutable HashMap
• 8:Learn How To Use Scala's Mutable ListMap
• 9: Learn How To Use Scala's Mutable LinkedHashMap
• 10: Learn How To Use Scala's Mutable Queue
• 11: Learn How To Use Scala's Mutable PriorityQueue
• 12: Learn How To Use Scala's Mutable Set
• 13: Learn How To Use Scala's Mutable HashSet
• 14: Learn How To Use Scala's Mutable SortedSet
• 15: Learn How To Use Scala's Mutable TreeSet
• 16: Learn How To Use Scala's Mutable LinkedHashSet
• 17: Learn How To Use Scala's Mutable BitSet

Chapter 8: Collection Functions

• 1: Introduction
• 2: Learn How To Use Aggregate Function
• 3: Learn How To Use Collect Function
• 4: Learn How To Use Diff Function
• 5: Learn How To Use Drop Function
• 6: Learn How To Use DropWhile Function
• 7: Learn How To Use Exists Function
• 8: Learn How To Use Filter And FilterNot Functions
• 9: Learn How To Use Find Function
• 10: Learn How To Use FlatMap Function
• 11: Learn How To Use Flatten Function
• 12: Learn How To Use Fold Function With Examples
• 13: Learn How To Use FoldLeft Function With Examples
• 14: Learn How To Use FoldRight Function With Examples
• 15: Learn How To Use Foreach Function With Examples
• 16: Learn How To Use GroupBy Function With Examples
• 17: Learn How To Use Head Function With Examples
• 18: Learn How To Use IsEmpty Function With Examples
• 19: Learn How To Use Intersect Function With Examples
• 20: Learn How To Use Last Function With Examples
• 21: Learn How To Use Map Function With Examples
• 22: Learn How To Use Max Function With Examples
• 23: Learn How To Use MaxBy Function With Examples
• 24: Learn How To Use Min Function With Examples
• 25: Learn How To Use MinBy Function With Examples
• 26: Learn How To Use MkString Function With Examples
• 27: Learn How To Use NonEmpty Function With Examples
• 28: Learn How To Use Par Function With Examples
• 29: Learn How To Use Partition Function With Examples
• 30: Learn How To Use Reduce Function With Examples
• 31: Learn How To Use ReduceLeft Function With Examples
• 32: Learn How To Use ReduceRight Function With Examples
• 33: Learn How To Use Reverse Function With Examples
• 34: Learn How To Use ReverseIterator Function With Examples
• 35: Learn How To Use Scan Function With Examples
• 36: Learn How To Use ScanLeft Function With Examples
• 37: Learn How To Use ScanRight Function With Examples
• 38: Learn How To Use Size Function With Examples
• 39: Learn How To Use Slice Function With Examples
• 40: Learn How To Use SortBy Function With Examples
• 41: Learn How To Use Sorted Function With Examples
• 42: Learn How To Use SortWith Function With Examples
• 43: Learn How To Use Tail Function With Examples
• 44: Learn How To Use Take Function With Examples
• 45: Learn How To Use TakeRight Function With Examples
• 46: Learn How To Use TakeWhile Function With Examples
• 47: Learn How To Use Transpose Function With Examples
• 48: Learn How To Use Union Function With Examples
• 49: Learn How To Use Unzip Function With Examples
• 50: Learn How To Use Unzip3 Function With Examples
• 51: Learn How To Use View Function With Examples
• 52: Learn How To Use WithFilter Function With Examples
• 53: Learn How To Use Zip Function With Examples
• 54: Learn How To Use ZipWithIndex Function With Examples

Chapter 9: Futures

• 1: Method with future as return type
• 2: Non blocking future result
• 3: Chain futures using flatMap
• 4: Chain futures using for comprehension

Chapter 10: Cheatsheet and Scala Test

Collection

• Convert Java collection

General

• Add line break
• Convert multi-line string into single line
• Check value of an Option
• Read file content as a String
• Create enum using sealed trait
• Int division and return float

Futures

• Cannot find an implicit ExecutionContext

Chapter 11: Learn SBT

Install SBT

• Install SBT on Windows
• Install SBT on Mac

sbt run

• Run a Scala main class

sbt test

• Run all tests
• Run only one specific test
• Run all integration tests
• Run a specific integration test
• Run one method in a test class

sbt debugging

• Analyze stacktrace in IntelliJ

sbt resources

• Show unmanaged classpaths
• Show unmanaged resources

Chapter 12: Learn Apache Spark 2

Chapter 12 - Part 1

Project Setup

• StackOverflow dataset
• Add Apache Spark 2.0 SBT dependencies
• Bootstrap a SparkSession

DataFrame SQL Query

• DataFrame Introduction
• Create a DataFrame from reading a CSV file
• DataFrame schema
• Select columns from a dataframe
• Filter by column value of a dataframe
• Count rows of a dataframe
• SQL like query
• Multiple filter chaining
• SQL IN clause
• SQL Group By
• SQL Group By with filter
• SQL order by
• Cast columns to specific data type
• Operate on a filtered dataframe
• DataFrame Join
• Join and select columns
• Join on explicit columns
• Inner Join
• Left Outer Join
• Right Outer Join
• Distinct

Chatper 12 - Part 2

Spark SQL

• Spark SQL Introduction
• Register temp table from dataframe
• List all tables in Spark's catalog
• List catalog tables using Spark SQL
• Select columns
• Filter by column value
• Count number of rows
• SQL like
• SQL where with and clause
• SQL IN clause
• SQL Group By
• SQL Group By with having clause
• SQL Order by
• Typed columns, filter and create temp table
• SQL Inner Join
• SQL Left Outer Join
• SQL Right Outer Join
• SQL Distinct
• Register User Defined Function (UDF)

Chapter 12 - Part 3

DataFrame Statistics

• DataFrame Statistics Introduction
• Create DataFrame from CSV
• Average
• Maximum
• Minimum
• Mean
• Sum
• Group by query with statistics
• DataFrame Statistics using describe() method
• Correlation
• Covariance
• Frequent Items
• Crosstab
• Stratified sampling using sampleBy
• Approximate Quantile
• Bloom Filter
• Count Min Sketch
• Sampling With Replacement

Chapter 12 - Part 4

DataFrame Operations

• DataFrame Operations Introduction
• Setup DataFrames
• Convert DataFrame row to Scala case class
• DataFrame row to Scala case class using map()
• Create DataFrame from collection
• DataFrame Union
• DataFrame Intersection
• Append column to DataFrame using withColumn() Stay in touch via Facebook and Twitter for upcoming tutorials!

Contact

Nadim Bahadoor at http://allaboutscala.com/contact/

License

Apache 2.0 License - see the LICENSE.TXT file