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Spis treści

Scala Cookbook. 2nd Edition eBook -- spis treści

• Preface
  • Conventions Used in This Book
  • Using Code Examples
  • OReilly Online Learning
  • How to Contact Us
• 1. Command-Line Tasks
  • 1.1. Getting Started with the Scala REPL
  • 1.2. Loading Source Code and JAR Files into the REPL
  • 1.3. Getting Started with the Ammonite REPL
  • 1.4. Compiling with scalac and Running with scala
  • 1.5. Disassembling and Decompiling Scala Code
  • 1.6. Running JAR Files with Scala and Java
• 2. Strings
  • 2.1. Testing String Equality
  • 2.2. Creating Multiline Strings
  • 2.3. Splitting Strings
  • 2.4. Substituting Variables into Strings
  • 2.5. Formatting String Output
  • 2.6. Processing a String One Character at a Time
  • 2.7. Finding Patterns in Strings
  • 2.8. Replacing Patterns in Strings
  • 2.9. Extracting Parts of a String That Match Patterns
  • 2.10. Accessing a Character in a String
  • 2.11. Creating Your Own String Interpolator
  • 2.12. Creating Random Strings
• 3. Numbers and Dates
  • 3.1. Parsing a Number from a String
  • 3.2. Converting Between Numeric Types (Casting)
  • 3.3. Overriding the Default Numeric Type
  • 3.4. Replacements for ++ and
  • 3.5. Comparing Floating-Point Numbers
  • 3.6. Handling Large Numbers
  • 3.7. Generating Random Numbers
  • 3.8. Formatting Numbers and Currency
  • 3.9. Creating New Date and Time Instances
  • 3.10. Calculating the Difference Between Two Dates
  • 3.11. Formatting Dates
  • 3.12. Parsing Strings into Dates
• 4. Control Structures
  • for Loops and for Expressions
  • if/then/else-if Expressions
  • match Expressions and Pattern Matching
  • try/catch/finally Blocks
  • while Loops
  • Control Structures as a Defining Feature of Programming Languages
  • 4.1. Looping over Data Structures with for
  • 4.2. Using for Loops with Multiple Counters
  • 4.3. Using a for Loop with Embedded if Statements (Guards)
  • 4.4. Creating a New Collection from an Existing Collection with for/yield
  • 4.5. Using the if Construct Like a Ternary Operator
  • 4.6. Using a Match Expression Like a switch Statement
  • 4.7. Matching Multiple Conditions with One Case Statement
  • 4.8. Assigning the Result of a Match Expression to a Variable
  • 4.9. Accessing the Value of the Default Case in a Match Expression
  • 4.10. Using Pattern Matching in Match Expressions
  • 4.11. Using Enums and Case Classes in match Expressions
  • 4.12. Adding if Expressions (Guards) to Case Statements
  • 4.13. Using a Match Expression Instead of isInstanceOf
  • 4.14. Working with a List in a Match Expression
  • 4.15. Matching One or More Exceptions with try/catch
  • 4.16. Declaring a Variable Before Using It in a try/catch/finally Block
  • 4.17. Creating Your Own Control Structures
• 5. Classes
  • Classes and Case Classes
  • 5.1. Choosing from Domain Modeling Options
  • 5.2. Creating a Primary Constructor
  • 5.3. Controlling the Visibility of Constructor Fields
  • 5.4. Defining Auxiliary Constructors for Classes
  • 5.5. Defining a Private Primary Constructor
  • 5.6. Providing Default Values for Constructor Parameters
  • 5.7. Handling Constructor Parameters When Extending a Class
  • 5.8. Calling a Superclass Constructor
  • 5.9. Defining an equals Method (Object Equality)
  • 5.10. Preventing Accessor and Mutator Methods from Being Generated
  • 5.11. Overriding Default Accessors and Mutators
  • 5.12. Assigning a Block or Function to a (lazy) Field
  • 5.13. Setting Uninitialized var Field Types
  • 5.14. Generating Boilerplate Code with Case Classes
  • 5.15. Defining Auxiliary Constructors for Case Classes
• 6. Traits and Enums
  • 6.1. Using a Trait as an Interface
  • 6.2. Defining Abstract Fields in Traits
  • 6.3. Using a Trait Like an Abstract Class
  • 6.4. Using Traits as Mixins
  • 6.5. Resolving Method Name Conflicts and Understanding super
  • 6.6. Marking Traits So They Can Only Be Used by Subclasses of a Certain Type
  • 6.7. Ensuring a Trait Can Only Be Added to a Type That Has a Specific Method
  • 6.8. Limiting Which Classes Can Use a Trait by Inheritance
  • 6.9. Working with Parameterized Traits
  • 6.10. Using Trait Parameters
  • 6.11. Using Traits to Create Modules
  • 6.12. How to Create Sets of Named Values with Enums
  • 6.13. Modeling Algebraic Data Types with Enums
• 7. Objects
  • 7.1. Casting Objects
  • 7.2. Passing a Class Type with the classOf Method
  • 7.3. Creating Singletons with object
  • 7.4. Creating Static Members with Companion Objects
  • 7.5. Using apply Methods in Objects as Constructors
  • 7.6. Implementing a Static Factory with apply
  • 7.7. Reifying Traits as Objects
  • 7.8. Implementing Pattern Matching with unapply
• 8. Methods
  • 8.1. Controlling Method Scope (Access Modifiers)
  • 8.2. Calling a Method on a Superclass or Trait
  • 8.3. Using Parameter Names When Calling a Method
  • 8.4. Setting Default Values for Method Parameters
  • 8.5. Creating Methods That Take Variable-Argument Fields
  • 8.6. Forcing Callers to Leave Parentheses Off Accessor Methods
  • 8.7. Declaring That a Method Can Throw an Exception
  • 8.8. Supporting a Fluent Style of Programming
  • 8.9. Adding New Methods to Closed Classes with Extension Methods
• 9. Packaging and Imports
  • 9.1. Packaging with the Curly Braces Style Notation
  • 9.2. Importing One or More Members
  • 9.3. Renaming Members on Import
  • 9.4. Hiding a Class During the Import Process
  • 9.5. Importing Static Members
  • 9.6. Using Import Statements Anywhere
  • 9.7. Importing Givens
• 10. Functional Programming
  • 10.1. Using Function Literals (Anonymous Functions)
  • 10.2. Passing Functions Around as Variables
  • 10.3. Defining a Method That Accepts a Simple Function Parameter
  • 10.4. Declaring More Complex Higher-Order Functions
  • 10.5. Using Partially Applied Functions
  • 10.6. Creating a Method That Returns a Function
  • 10.7. Creating Partial Functions
  • 10.8. Implementing Functional Error Handling
  • 10.9. Real-World Example: Passing Functions Around in an Algorithm
  • 10.10. Real-World Example: Functional Domain Modeling
• 11. Collections: Introduction
  • Understanding the Collections Hierarchy
  • 11.1. Choosing a Collections Class
  • 11.2. Understanding the Performance of Collections
  • 11.3. Understanding Mutable Variables with Immutable Collections
  • 11.4. Creating a Lazy View on a Collection
• 12. Collections: Common Sequence Classes
  • 12.1. Making Vector Your Go-To Immutable Sequence
  • 12.2. Creating and Populating a List
  • 12.3. Adding Elements to a List
  • 12.4. Deleting Elements from a List (or ListBuffer)
  • 12.5. Creating a Mutable List with ListBuffer
  • 12.6. Using LazyList, a Lazy Version of a List
  • 12.7. Making ArrayBuffer Your Go-To Mutable Sequence
  • 12.8. Deleting Array and ArrayBuffer Elements
  • 12.9. Creating and Updating an Array
  • 12.10. Creating Multidimensional Arrays
  • 12.11. Sorting Arrays
• 13. Collections: Common Sequence Methods
  • Predicate
  • Anonymous Functions
  • Implied Loops
  • Recipes in This Chapter
  • 13.1. Choosing a Collection Method to Solve a Problem
  • 13.2. Looping Over a Collection with foreach
  • 13.3. Using Iterators
  • 13.4. Using zipWithIndex or zip to Create Loop Counters
  • 13.5. Transforming One Collection to Another with map
  • 13.6. Flattening a List of Lists with flatten
  • 13.7. Using filter to Filter a Collection
  • 13.8. Extracting a Sequence of Elements from a Collection
  • 13.9. Splitting Sequences into Subsets
  • 13.10. Walking Through a Collection with the reduce and fold Methods
  • 13.11. Finding the Unique Elements in a Sequence
  • 13.12. Merging Sequential Collections
  • 13.13. Randomizing a Sequence
  • 13.14. Sorting a Collection
  • 13.15. Converting a Collection to a String with mkString and addString
• 14. Collections: Using Maps
  • 14.1. Creating and Using Maps
  • 14.2. Choosing a Map Implementation
  • 14.3. Adding, Updating, and Removing Immutable Map Elements
  • 14.4. Adding, Updating, and Removing Elements in Mutable Maps
  • 14.5. Accessing Map Values (Without Exceptions)
  • 14.6. Testing for the Existence of a Key or Value in a Map
  • 14.7. Getting the Keys or Values from a Map
  • 14.8. Finding the Largest (or Smallest) Key or Value in a Map
  • 14.9. Traversing a Map
  • 14.10. Sorting an Existing Map by Key or Value
  • 14.11. Filtering a Map
• 15. Collections: Tuple, Range, Set, Stack, and Queue
  • 15.1. Creating Heterogeneous Lists with Tuples
  • 15.2. Creating Ranges
  • 15.3. Creating a Set and Adding Elements to It
  • 15.4. Deleting Elements from Sets
  • 15.5. Storing Values in a Set in Sorted Order
  • 15.6. Creating and Using a Stack
  • 15.7. Creating and Using a Queue
• 16. Files and Processes
  • 16.1. Reading Text Files
  • 16.2. Writing Text Files
  • 16.3. Reading and Writing Binary Files
  • 16.4. Pretending That a String Is a File
  • 16.5. Serializing and Deserializing Objects to Files
  • 16.6. Listing Files in a Directory
  • 16.7. Executing External Commands
  • 16.8. Executing External Commands and Reading Their STDOUT
  • 16.9. Handling Both STDOUT and STDERR of Commands
  • 16.10. Building a Pipeline of External Commands
• 17. Building Projects with sbt
  • 17.1. Creating a Project Directory Structure for sbt
  • 17.2. Building Projects with the sbt Command
  • 17.3. Understanding build.sbt Syntax Styles
  • 17.4. Compiling, Running, and Packaging a Scala Project
  • 17.5. Understanding Other sbt Commands
  • 17.6. Continuous Compiling and Testing
  • 17.7. Managing Dependencies with sbt
  • 17.8. Controlling Which Version of a Managed Dependency Is Used
  • 17.9. Generating Project API Documentation
  • 17.10. Specifying a Main Class to Run with sbt
  • 17.11. Deploying a Single Executable JAR File
  • 17.12. Publishing Your Library
• 18. Concurrency with Scala Futures and Akka Actors
  • 18.1. Creating a Future
  • 18.2. Using Callback and Transformation Methods with Futures
  • 18.3. Writing Methods That Return Futures
  • 18.4. Running Multiple Futures in Parallel
  • 18.5. Creating OOP-Style Actors
  • 18.6. Creating FP-Style Actors
  • 18.7. Sending Messages to Actors
  • 18.8. Creating Actors That Have Multiple States (FSM)
• 19. Play Framework and Web Services
  • 19.1. Creating a Play Framework Project
  • 19.2. Creating a New Play Framework Endpoint
  • 19.3. Returning JSON from a GET Request with Play
  • 19.4. Serializing a Scala Object to a JSON String
  • 19.5. Deserializing JSON into a Scala Object
  • 19.6. Using the Play JSON Library Outside of the Play Framework
  • 19.7. Using the sttp HTTP Client
• 20. Apache Spark
  • 20.1. Getting Started with Spark
  • 20.2. Reading a File into a Spark RDD
  • 20.3. Reading a CSV File into a Spark RDD
  • 20.4. Using Spark Like a Database with DataFrames
  • 20.5. Reading Data Files into a Spark DataFrame
  • 20.6. Using Spark SQL Queries Against Multiple Files
  • 20.7. Creating a Spark Batch Application
• 21. Scala.js, GraalVM, and jpackage
  • 21.1. Getting Started with Scala.js
  • 21.2. Responding to Events with Scala.js
  • 21.3. Building Single-Page Applications with Scala.js
  • 21.4. Building Native Executables with GraalVM
  • 21.5. Bundling Your Application with jpackage
• 22. Integrating Scala with Java
  • 22.1. Using Java Collections in Scala
  • 22.2. Using Scala Collections in Java
  • 22.3. Using Java Optional Values in Scala
  • 22.4. Using Scala Option Values in Java
  • 22.5. Using Scala Traits in Java
  • 22.6. Using Java Interfaces in Scala
  • 22.7. Adding Exception Annotations to Scala Methods
  • 22.8. Annotating varargs Methods to Work with Java
  • 22.9. Using @SerialVersionUID and Other Annotations
• 23. Types
  • 23.1. Creating a Method That Takes a Simple Generic Type
  • 23.2. Creating Classes That Use Simple Generic Types
  • 23.3. Making Immutable Generic Parameters Covariant
  • 23.4. Creating a Class Whose Generic Elements Can Be Mutated
  • 23.5. Creating a Class Whose Parameters Implement a Base Type
  • 23.6. Using Duck Typing (Structural Types)
  • 23.7. Creating Meaningful Type Names with Opaque Types
  • 23.8. Using Term Inference with given and using
  • 23.9. Simulating Dynamic Typing with Union Types
  • 23.10. Declaring That a Value Is a Combination of Types
  • 23.11. Controlling How Classes Can Be Compared with Multiversal Equality
  • 23.12. Limiting Equality Comparisons with the CanEqual Typeclass
• 24. Best Practices
  • 24.1. Writing Pure Functions
  • 24.2. Using Immutable Variables and Collections
  • 24.3. Writing Expressions (Instead of Statements)
  • 24.4. Using Match Expressions and Pattern Matching
  • 24.5. Eliminating null Values from Your Code
  • 24.6. Using Scalas Error-Handling Types (Option, Try, and Either)
  • 24.7. Building Modular Systems
  • 24.8. Handling Option Values with Higher-Order Functions
• Index