Let's delve a bit deeper to understand the consequences of being functional, as illustrated by the definitions given in the preceding section. Now, when we try to relate functions from both these worlds (mathematical and imperative programming), we see a strong disparity, as the latter mutates state with commands in the source language, thereby bringing in side effects (though desirable from an imperative programming standpoint). This violates one of the fundamental pre-requisites of functional programming - that of referential transparency, that is, the same expressions (when run at different times) yield different values with respect to the executing program's state. This affects the predictability of the program, which is definitely not desirable. On the other hand, pure functions (say f, one without such side effects) in the mathematical world would yield the same result f(x) each time with the same value of x, say sin(x). This characteristic is attributed to...
.NET Design Patterns
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.NET Design Patterns
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Overview of this book
Knowing about design patterns enables developers to improve their code base, promoting code reuse and making their design more robust.
This book focuses on the practical aspects of programming in .NET. You will learn about some of the relevant design patterns (and their application) that are most widely used. We start with classic object-oriented programming (OOP) techniques, evaluate parallel programming and concurrency models, enhance implementations by mixing OOP and functional programming, and finally to the reactive programming model where functional programming and OOP are used in synergy to write better code.
Throughout this book, we’ll show you how to deal with architecture/design techniques, GoF patterns, relevant patterns from other catalogs, functional programming, and reactive programming techniques.
After reading this book, you will be able to convincingly leverage these design patterns (factory pattern, builder pattern, prototype pattern, adapter pattern, facade pattern, decorator pattern, observer pattern and so on) for your programs. You will also be able to write fluid functional code in .NET that would leverage concurrency and parallelism!
Table of Contents (22 chapters)
.NET Design Patterns
Credits
Foreword
About the Authors
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
Free Chapter
An Introduction to Patterns and Pattern Catalogs
Why We Need Design Patterns?
A Logging Library
Targeting Multiple Databases
Producing Tabular Reports
Plotting Mathematical Expressions
Patterns in the .NET Base Class Library
Concurrent and Parallel Programming under .NET
Functional Programming Techniques for Better State Management
Pattern Implementation Using Object/Functional Programming
What is Reactive Programming?
Reactive Programming Using .NET Rx Extensions
Reactive Programming Using RxJS
Customer Reviews