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Real World Haskell. Code You Can Believe In - Helion

Real World Haskell. Code You Can Believe In
ebook
Autor: Bryan O'Sullivan, John Goerzen, Donald Bruce Stewart
ISBN: 978-05-965-5430-9
stron: 714, Format: ebook
Data wydania: 2008-11-15
Księgarnia: Helion

Cena książki: 152,15 zł (poprzednio: 176,92 zł)
Oszczędzasz: 14% (-24,77 zł)

Dodaj do koszyka Real World Haskell. Code You Can Believe In

Tagi: Inne - Programowanie

This easy-to-use, fast-moving tutorial introduces you to functional programming with Haskell. You'll learn how to use Haskell in a variety of practical ways, from short scripts to large and demanding applications. Real World Haskell takes you through the basics of functional programming at a brisk pace, and then helps you increase your understanding of Haskell in real-world issues like I/O, performance, dealing with data, concurrency, and more as you move through each chapter.

With this book, you will:

  • Understand the differences between procedural and functional programming
  • Learn the features of Haskell, and how to use it to develop useful programs
  • Interact with filesystems, databases, and network services
  • Write solid code with automated tests, code coverage, and error handling
  • Harness the power of multicore systems via concurrent and parallel programming

You'll find plenty of hands-on exercises, along with examples of real Haskell programs that you can modify, compile, and run. Whether or not you've used a functional language before, if you want to understand why Haskell is coming into its own as a practical language in so many major organizations, Real World Haskell is the best place to start.

Dodaj do koszyka Real World Haskell. Code You Can Believe In

 

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Dodaj do koszyka Real World Haskell. Code You Can Believe In

Spis treści

Real World Haskell. Code You Can Believe In eBook -- spis treści

  • Real World Haskell
  • Dedication
  • A Note Regarding Supplemental Files
  • Preface
    • Have We Got a Deal for You!
      • Novelty
      • Power
      • Enjoyment
    • What to Expect from This Book
      • A Little Bit About You
    • What to Expect from Haskell
      • Compared to Traditional Static Languages
      • Compared to Modern Dynamic Languages
      • Haskell in Industry and Open Source
      • Compilation, Debugging, and Performance Analysis
      • Bundled and Third-Party Libraries
    • A Brief Sketch of Haskells History
      • Prehistory
      • Early Antiquity
      • The Modern Era
    • Helpful Resources
      • Reference Material
      • Applications and Libraries
      • The Haskell Community
    • Conventions Used in This Book
    • Using Code Examples
    • Safari Books Online
    • How to Contact Us
    • Acknowledgments
      • Bryan
      • John
      • Don
      • Thank You to Our Reviewers
  • 1. Getting Started
    • Your Haskell Environment
    • Getting Started with ghci, the Interpreter
    • Basic Interaction: Using ghci as a Calculator
      • Simple Arithmetic
      • An Arithmetic Quirk: Writing Negative Numbers
      • Boolean Logic, Operators, and Value Comparisons
      • Operator Precedence and Associativity
      • Undefined Values, and Introducing Variables
      • Dealing with Precedence and Associativity Rules
    • Command-Line Editing in ghci
    • Lists
      • Operators on Lists
    • Strings and Characters
    • First Steps with Types
    • A Simple Program
  • 2. Types and Functions
    • Why Care About Types?
    • Haskells Type System
      • Strong Types
      • Static Types
      • Type Inference
    • What to Expect from the Type System
    • Some Common Basic Types
    • Function Application
    • Useful Composite Data Types: Lists and Tuples
    • Functions over Lists and Tuples
      • Passing an Expression to a Function
    • Function Types and Purity
    • Haskell Source Files, and Writing Simple Functions
      • Just What Is a Variable, Anyway?
      • Conditional Evaluation
    • Understanding Evaluation by Example
      • Lazy Evaluation
      • A More Involved Example
      • Recursion
      • Ending the Recursion
      • Returning from the Recursion
      • What Have We Learned?
    • Polymorphism in Haskell
      • Reasoning About Polymorphic Functions
      • Further Reading
    • The Type of a Function of More Than One Argument
    • Why the Fuss over Purity?
    • Conclusion
  • 3. Defining Types, Streamlining Functions
    • Defining a New Data Type
      • Naming Types and Values
    • Type Synonyms
    • Algebraic Data Types
      • Tuples, Algebraic Data Types, and When to Use Each
      • Analogues to Algebraic Data Types in Other Languages
        • The structure
        • The enumeration
        • The discriminated union
    • Pattern Matching
      • Construction and Deconstruction
      • Further Adventures
      • Variable Naming in Patterns
      • The Wild Card Pattern
      • Exhaustive Patterns and Wild Cards
    • Record Syntax
    • Parameterized Types
    • Recursive Types
    • Reporting Errors
      • A More Controlled Approach
    • Introducing Local Variables
      • Shadowing
      • The where Clause
      • Local Functions, Global Variables
    • The Offside Rule and Whitespace in an Expression
      • A Note About Tabs Versus Spaces
      • The Offside Rule Is Not Mandatory
    • The case Expression
    • Common Beginner Mistakes with Patterns
      • Incorrectly Matching Against a Variable
      • Incorrectly Trying to Compare for Equality
    • Conditional Evaluation with Guards
  • 4. Functional Programming
    • Thinking in Haskell
    • A Simple Command-Line Framework
    • Warming Up: Portably Splitting Lines of Text
      • A Line-Ending Conversion Program
    • Infix Functions
    • Working with Lists
      • Basic List Manipulation
      • Safely and Sanely Working with Crashy Functions
      • Partial and Total Functions
      • More Simple List Manipulations
      • Working with Sublists
      • Searching Lists
      • Working with Several Lists at Once
      • Special String-Handling Functions
    • How to Think About Loops
      • Explicit Recursion
      • Transforming Every Piece of Input
      • Mapping over a List
      • Selecting Pieces of Input
      • Computing One Answer over a Collection
      • The Left Fold
      • Why Use Folds, Maps, and Filters?
      • Folding from the Right
      • Left Folds, Laziness, and Space Leaks
      • Further Reading
    • Anonymous (lambda) Functions
    • Partial Function Application and Currying
      • Sections
    • As-patterns
    • Code Reuse Through Composition
      • Use Your Head Wisely
    • Tips for Writing Readable Code
    • Space Leaks and Strict Evaluation
      • Avoiding Space Leaks with seq
      • Learning to Use seq
  • 5. Writing a Library: Working with JSON Data
    • A Whirlwind Tour of JSON
    • Representing JSON Data in Haskell
    • The Anatomy of a Haskell Module
    • Compiling Haskell Source
    • Generating a Haskell Program and Importing Modules
    • Printing JSON Data
    • Type Inference Is a Double-Edged Sword
    • A More General Look at Rendering
    • Developing Haskell Code Without Going Nuts
    • Pretty Printing a String
    • Arrays and Objects, and the Module Header
    • Writing a Module Header
    • Fleshing Out the Pretty-Printing Library
      • Compact Rendering
      • True Pretty Printing
      • Following the Pretty Printer
    • Creating a Package
      • Writing a Package Description
      • GHCs Package Manager
      • Setting Up, Building, and Installing
    • Practical Pointers and Further Reading
  • 6. Using Typeclasses
    • The Need for Typeclasses
    • What Are Typeclasses?
    • Declaring Typeclass Instances
    • Important Built-in Typeclasses
      • Show
      • Read
      • Serialization with read and show
      • Numeric Types
      • Equality, Ordering, and Comparisons
    • Automatic Derivation
    • Typeclasses at Work: Making JSON Easier to Use
      • More Helpful Errors
      • Making an Instance with a Type Synonym
    • Living in an Open World
      • When Do Overlapping Instances Cause Problems?
      • Relaxing Some Restrictions on Typeclasses
      • How Does Show Work for Strings?
    • How to Give a Type a New Identity
      • Differences Between Data and Newtype Declarations
      • Summary: The Three Ways of Naming Types
    • JSON Typeclasses Without Overlapping Instances
    • The Dreaded Monomorphism Restriction
    • Conclusion
  • 7. I/O
    • Classic I/O in Haskell
      • Pure Versus I/O
      • Why Purity Matters
    • Working with Files and Handles
      • More on openFile
      • Closing Handles
      • Seek and Tell
      • Standard Input, Output, and Error
      • Deleting and Renaming Files
      • Temporary Files
    • Extended Example: Functional I/O and Temporary Files
    • Lazy I/O
      • hGetContents
      • readFile and writeFile
      • A Word on Lazy Output
      • interact
        • Filters with interact
    • The IO Monad
      • Actions
      • Sequencing
      • The True Nature of Return
    • Is Haskell Really Imperative?
    • Side Effects with Lazy I/O
    • Buffering
      • Buffering Modes
      • Flushing The Buffer
    • Reading Command-Line Arguments
    • Environment Variables
  • 8. Efficient File Processing, Regular Expressions, and Filename Matching
    • Efficient File Processing
      • Binary I/O and Qualified Imports
      • Text I/O
    • Filename Matching
    • Regular Expressions in Haskell
      • The Many Types of Result
    • More About Regular Expressions
      • Mixing and Matching String Types
      • Other Things You Should Know
    • Translating a glob Pattern into a Regular Expression
    • An important Aside: Writing Lazy Functions
    • Making Use of Our Pattern Matcher
    • Handling Errors Through API Design
    • Putting Our Code to Work
  • 9. I/O Case Study: A Library for Searching the Filesystem
    • The find Command
    • Starting Simple: Recursively Listing a Directory
      • Revisiting Anonymous and Named Functions
      • Why Provide Both mapM and forM?
    • A Naive Finding Function
    • Predicates: From Poverty to Riches, While Remaining Pure
    • Sizing a File Safely
      • The Acquire-Use-Release Cycle
    • A Domain-Specific Language for Predicates
      • Avoiding Boilerplate with Lifting
      • Gluing Predicates Together
      • Defining and Using New Operators
    • Controlling Traversal
    • Density, Readability, and the Learning Process
    • Another Way of Looking at Traversal
    • Useful Coding Guidelines
      • Common Layout Styles
  • 10. Code Case Study: Parsing a Binary Data Format
    • Grayscale Files
    • Parsing a Raw PGM File
    • Getting Rid of Boilerplate Code
    • Implicit State
      • The Identity Parser
      • Record Syntax, Updates, and Pattern Matching
      • A More Interesting Parser
      • Obtaining and Modifying the Parse State
      • Reporting Parse Errors
      • Chaining Parsers Together
    • Introducing Functors
      • Constraints on Type Definitions Are Bad
      • Infix Use of fmap
      • Flexible Instances
      • Thinking More About Functors
    • Writing a Functor Instance for Parse
    • Using Functors for Parsing
    • Rewriting Our PGM Parser
    • Future Directions
  • 11. Testing and Quality Assurance
    • QuickCheck: Type-Based Testing
      • Testing for Properties
      • Testing Against a Model
    • Testing Case Study: Specifying a Pretty Printer
      • Generating Test Data
      • Testing Document Construction
      • Using Lists as a Model
      • Putting It All Together
    • Measuring Test Coverage with HPC
  • 12. Barcode Recognition
    • A Little Bit About Barcodes
      • EAN-13 Encoding
    • Introducing Arrays
      • Arrays and Laziness
      • Folding over Arrays
      • Modifying Array Elements
    • Encoding an EAN-13 Barcode
    • Constraints on Our Decoder
    • Divide and Conquer
    • Turning a Color Image into Something Tractable
      • Parsing a Color Image
      • Grayscale Conversion
      • Grayscale to Binary and Type Safety
    • What Have We Done to Our Image?
    • Finding Matching Digits
      • Run Length Encoding
      • Scaling Run Lengths, and Finding Approximate Matches
      • List Comprehensions
      • Remembering a Matchs Parity
        • Another kind of laziness, of the keyboarding variety
      • Chunking a List
      • Generating a List of Candidate Digits
    • Life Without Arrays or Hash Tables
      • A Forest of Solutions
      • A Brief Introduction to Maps
        • Type constraints
        • Partial application awkwardness
        • Getting started with the API
      • Further Reading
    • Turning Digit Soup into an Answer
      • Solving for Check Digits in Parallel
      • Completing the Solution Map with the First Digit
      • Finding the Correct Sequence
    • Working with Row Data
    • Pulling It All Together
    • A Few Comments on Development Style
  • 13. Data Structures
    • Association Lists
    • Maps
    • Functions Are Data, Too
    • Extended Example: /etc/passwd
    • Extended Example: Numeric Types
      • First Steps
      • Completed Code
    • Taking Advantage of Functions as Data
      • Turning Difference Lists into a Proper Library
      • Lists, Difference Lists, and Monoids
    • General-Purpose Sequences
  • 14. Monads
    • Revisiting Earlier Code Examples
      • Maybe Chaining
      • Implicit State
    • Looking for Shared Patterns
    • The Monad Typeclass
    • And Now, a Jargon Moment
    • Using a New Monad: Show Your Work!
      • Information Hiding
      • Controlled Escape
      • Leaving a Trace
      • Using the Logger Monad
    • Mixing Pure and Monadic Code
    • Putting a Few Misconceptions to Rest
    • Building the Logger Monad
      • Sequential Logging, Not Sequential Evaluation
      • The Writer Monad
    • The Maybe Monad
      • Executing the Maybe Monad
      • Maybe at Work, and Good API Design
    • The List Monad
      • Understanding the List Monad
      • Putting the List Monad to Work
    • Desugaring of do Blocks
      • Monads as a Programmable Semicolon
      • Why Go Sugar-Free?
    • The State Monad
      • Almost a State Monad
      • Reading and Modifying the State
      • Will the Real State Monad Please Stand Up?
      • Using the State Monad: Generating Random Values
      • A First Attempt at Purity
      • Random Values in the State Monad
      • Running the State Monad
      • What About a Bit More State?
    • Monads and Functors
      • Another Way of Looking at Monads
    • The Monad Laws and Good Coding Style
  • 15. Programming with Monads
    • Golfing Practice: Association Lists
    • Generalized Lifting
    • Looking for Alternatives
      • The Name mplus Does Not Imply Addition
      • Rules for Working with MonadPlus
      • Failing Safely with MonadPlus
    • Adventures in Hiding the Plumbing
      • Supplying Random Numbers
      • Another Round of Golf
    • Separating Interface from Implementation
      • Multiparameter Typeclasses
      • Functional Dependencies
      • Rounding Out Our Module
      • Programming to a Monads Interface
    • The Reader Monad
    • A Return to Automated Deriving
    • Hiding the IO Monad
      • Using a newtype
      • Designing for Unexpected Uses
      • Using Typeclasses
      • Isolation and Testing
      • The Writer Monad and Lists
      • Arbitrary I/O Revisited
  • 16. Using Parsec
    • First Steps with Parsec: Simple CSV Parsing
    • The sepBy and endBy Combinators
    • Choices and Errors
      • Lookahead
      • Error Handling
    • Extended Example: Full CSV Parser
    • Parsec and MonadPlus
    • Parsing a URL-Encoded Query String
    • Supplanting Regular Expressions for Casual Parsing
    • Parsing Without Variables
    • Applicative Functors for Parsing
    • Applicative Parsing by Example
    • Parsing JSON Data
    • Parsing a HTTP Request
      • Backtracking and Its Discontents
      • Parsing Headers
  • 17. Interfacing with C: The FFI
    • Foreign Language Bindings: The Basics
      • Be Careful of Side Effects
      • A High-Level Wrapper
    • Regular Expressions for Haskell: A Binding for PCRE
      • Simple Tasks: Using the C Preprocessor
      • Binding Haskell to C with hsc2hs
      • Adding Type Safety to PCRE
      • Binding to Constants
      • Automating the Binding
    • Passing String Data Between Haskell and C
      • Typed Pointers
      • Memory Management: Let the Garbage Collector Do the Work
      • A High-Level Interface: Marshaling Data
      • Marshaling ByteStrings
      • Allocating Local C Data: The Storable Class
      • Putting It All Together
    • Matching on Strings
      • Extracting Information About the Pattern
      • Pattern Matching with Substrings
      • The Real Deal: Compiling and Matching Regular Expressions
  • 18. Monad Transformers
    • Motivation: Boilerplate Avoidance
    • A Simple Monad Transformer Example
    • Common Patterns in Monads and Monad Transformers
    • Stacking Multiple Monad Transformers
      • Hiding Our Work
    • Moving Down the Stack
      • When Explicit Lifting Is Necessary
    • Understanding Monad Transformers by Building One
      • Creating a Monad Transformer
      • More Typeclass Instances
      • Replacing the Parse Type with a Monad Stack
    • Transformer Stacking Order Is Important
    • Putting Monads and Monad Transformers into Perspective
      • Interference with Pure Code
      • Overdetermined Ordering
      • Runtime Overhead
      • Unwieldy Interfaces
      • Pulling It All Together
  • 19. Error Handling
    • Error Handling with Data Types
      • Use of Maybe
        • Loss and preservation of laziness
        • Usage of the Maybe monad
      • Use of Either
        • Custom data types for errors
        • Monadic use of Either
    • Exceptions
      • First Steps with Exceptions
      • Laziness and Exception Handling
      • Using handle
      • Selective Handling of Exceptions
      • I/O Exceptions
      • Throwing Exceptions
      • Dynamic Exceptions
    • Error Handling in Monads
      • A Tiny Parsing Framework
  • 20. Systems Programming in Haskell
    • Running External Programs
    • Directory and File Information
    • Program Termination
    • Dates and Times
      • ClockTime and CalendarTime
        • Using ClockTime
        • Using CalendarTime
        • TimeDiff for ClockTime
      • File Modification Times
    • Extended Example: Piping
      • Using Pipes for Redirection
      • Better Piping
      • Final Words on Pipes
  • 21. Using Databases
    • Overview of HDBC
    • Installing HDBC and Drivers
    • Connecting to Databases
    • Transactions
    • Simple Queries
    • SqlValue
    • Query Parameters
    • Prepared Statements
    • Reading Results
      • Reading with Statements
      • Lazy Reading
    • Database Metadata
    • Error Handling
  • 22. Extended Example: Web Client Programming
    • Basic Types
    • The Database
    • The Parser
    • Downloading
    • Main Program
  • 23. GUI Programming with gtk2hs
    • Installing gtk2hs
    • Overview of the GTK+ Stack
    • User Interface Design with Glade
      • Glade Concepts
    • Event-Driven Programming
    • Initializing the GUI
    • The Add Podcast Window
    • Long-Running Tasks
    • Using Cabal
  • 24. Concurrent and Multicore Programming
    • Defining Concurrency and Parallelism
    • Concurrent Programming with Threads
      • Threads Are Nondeterministic
      • Hiding Latency
    • Simple Communication Between Threads
    • The Main Thread and Waiting for Other Threads
      • Safely Modifying an MVar
      • Safe Resource Management: A Good Idea, and Easy Besides
      • Finding the Status of a Thread
      • Writing Tighter Code
    • Communicating over Channels
    • Useful Things to Know About
      • MVar and Chan Are Nonstrict
      • Chan Is Unbounded
    • Shared-State Concurrency Is Still Hard
      • Deadlock
      • Starvation
      • Is There Any Hope?
    • Using Multiple Cores with GHC
      • Runtime Options
      • Finding the Number of Available Cores from Haskell
      • Choosing the Right Runtime
    • Parallel Programming in Haskell
      • Normal Form and Head Normal Form
      • Sequential Sorting
      • Transforming Our Code into Parallel Code
      • Knowing What to Evaluate in Parallel
      • What Promises Does par Make?
      • Running Our Code and Measuring Performance
      • Tuning for Performance
    • Parallel Strategies and MapReduce
      • Separating Algorithm from Evaluation
      • Separating Algorithm from Strategy
      • Writing a Simple MapReduce Definition
      • MapReduce and Strategies
      • Sizing Work Appropriately
        • Mitigating the risks of lazy I/O
      • Efficiently Finding Line-Aligned Chunks
      • Counting Lines
      • Finding the Most Popular URLs
      • Conclusions
  • 25. Profiling and Optimization
    • Profiling Haskell Programs
      • Collecting Runtime Statistics
      • Time Profiling
      • Space Profiling
    • Controlling Evaluation
      • Strictness and Tail Recursion
      • Adding Strictness
        • Normal form reduction
        • Bang patterns
        • Strict data types
    • Understanding Core
    • Advanced Techniques: Fusion
      • Tuning the Generated Assembly
      • Conclusions
  • 26. Advanced Library Design: Building a Bloom Filter
    • Introducing the Bloom Filter
    • Use Cases and Package Layout
    • Basic Design
      • Unboxing, Lifting, and Bottom
    • The ST Monad
    • Designing an API for Qualified Import
    • Creating a Mutable Bloom Filter
    • The Immutable API
    • Creating a Friendly Interface
      • Re-Exporting Names for Convenience
      • Hashing Values
      • Turning Two Hashes into Many
      • Implementing the Easy Creation Function
    • Creating a Cabal Package
      • Dealing with Different Build Setups
      • Compilation Options and Interfacing to C
    • Testing with QuickCheck
      • Polymorphic Testing
      • Writing Arbitrary Instances for ByteStrings
      • Are Suggested Sizes Correct?
    • Performance Analysis and Tuning
      • Profile-Driven Performance Tuning
  • 27. Sockets and Syslog
    • Basic Networking
    • Communicating with UDP
      • UDP Client Example: syslog
      • UDP Syslog Server
    • Communicating with TCP
      • Handling Multiple TCP Streams
      • TCP Syslog Server
      • TCP Syslog Client
  • 28. Software Transactional Memory
    • The Basics
    • Some Simple Examples
    • STM and Safety
    • Retrying a Transaction
      • What Happens When We Retry?
    • Choosing Between Alternatives
      • Using Higher Order Code with Transactions
    • I/O and STM
    • Communication Between Threads
    • A Concurrent Web Link Checker
      • Checking a Link
      • Worker Threads
      • Finding Links
      • Command-Line Parsing
      • Pattern Guards
    • Practical Aspects of STM
      • Getting Comfortable with Giving Up Control
      • Using Invariants
  • A. Installing GHC and Haskell Libraries
    • Installing GHC
      • Windows
      • Mac OS X
        • Alternatives
      • Ubuntu and Debian Linux
      • Fedora Linux
      • FreeBSD
    • Installing Haskell Software
      • Automated Download and Installation with cabal
        • Installing cabal
        • Updating cabals package list
        • Installing a library or program
      • Building Packages by Hand
  • B. Characters, Strings, and Escaping Rules
    • Writing Character and String Literals
    • International Language Support
    • Escaping Text
      • Single-Character Escape Codes
      • Multiline String Literals
      • ASCII Control Codes
      • Control-with-Character Escapes
      • Numeric Escapes
      • The Zero-Width Escape Sequence
  • Index
  • About the Authors
  • Colophon
  • Copyright

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