探索F#：微软MVP的函数式编程指南

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"The Book of F#(NoStarch,2014) 是一本由Dave Fancher编著的书籍，旨在向.NET框架开发者介绍功能优先编程语言F#，并帮助他们转变编码思维。F#是微软Windows生态系统中的一个强大工具，它提供了默认不可变性、管道操作、类型推断和模式匹配等特性，使得代码更简洁、可靠和可预测。本书适合习惯于C#和Visual Basic的传统.NET开发者阅读，以领略F#的魅力并提升编程效率。" 在《The Book of F#》中，作者深入浅出地介绍了F#的核心概念和实践技巧。首先，F#作为一门函数式编程语言，它的主要优势在于将函数视为第一类公民，这意味着函数可以像其他数据类型一样被处理，例如作为参数传递或返回值。这种设计模式鼓励编写无副作用的代码，增强了程序的可预测性和测试性。 其次，F#中的默认不可变性是另一个关键特性。这要求开发者在不创建新对象的情况下，不能改变对象的状态，从而减少了并发编程中的许多问题，如数据竞争和死锁。不可变数据结构在多线程环境中特别有价值，因为它们天生就具有线程安全的属性。 管道操作（|>）是F#中的一种独特语法，它允许将函数应用于表达式的输出，使得代码更加流畅和易于阅读。通过管道，你可以构建出清晰的从左到右的数据流，而不是嵌套的函数调用。 类型推断是F#的另一大亮点。编译器能够根据代码的上下文自动推断变量的类型，减少了显式声明类型的繁琐，同时也减少了类型错误的可能性。这使得代码更简洁，也更易于维护。 模式匹配是F#中强大的控制流构造，它允许开发者根据值的不同形态执行不同的代码块。这在处理数据结构，特别是处理枚举、元组和自定义类型时非常有用，简化了条件判断和解构过程。 此外，书中还涵盖了F#与其他.NET语言（如C#和VB.NET）的互操作性，以及如何利用F#在数据分析、机器学习和Web开发等领域的应用。技术审查者Kevin Miller和Tomas Petricek的专业审阅确保了内容的准确性和实用性。 《The Book of F#》是一本全面介绍F#语言的指南，无论是对.NET开发者初次接触函数式编程，还是希望深化对F#理解的高级开发者，都能从中受益。通过阅读此书，读者不仅可以学习到F#的语法和特性，还能体会到函数式编程思想对提升软件开发质量和效率的积极影响。

The Book of F#

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In The Book of F#, Microsoft MVP Dave Fancher shares his expertise and teaches you how to wield the power of F# to write succinct, reliable, and predictable code. As you learn to take advantage of ...

class Book: def init(self, title, author, isbn): self.title = title self.author = author self.isbn = isbn def str(self): return f"{self.title} by {self.author}" class Library: def init(self): self.books = [] def add_book(self, book): self.books.append(book) def search_book_by_title(self, title): results = [] for book in self.books: if title.lower() in book.title.lower(): results.append(book) return results def search_book_by_author(self, author): results = [] for book in self.books: if author.lower() in book.author.lower(): results.append(book) return results def checkout_book(self, book): if book in self.books: self.books.remove(book) return book else: return None def return_book(self, book): self.books.append(book) return book # sample usage book1 = Book('The Great Gatsby', 'F. Scott Fitzgerald', '978-0743273565') book2 = Book('To Kill a Mockingbird', 'Harper Lee', '978-0446310789') book3 = Book('1984', 'George Orwell', '978-0451524935') library = Library() library.add_book(book1) library.add_book(book2) library.add_book(book3) print(library.search_book_by_title('the')) print(library.search_book_by_author('scott fitzgerald')) book4 = Book('Pride and Prejudice', 'Jane Austen', '978-0486284736') library.add_book(book4) print(library.search_book_by_author('Jane Austen')) checked_out = library.checkout_book(book4) print(f"Book checked out: {checked_out}") returned = library.return_book(book4) print(f"Book returned: {returned}")，在程序中写上注释

2023-05-24 上传
book1 = Book('The Great Gatsby', 'F. Scott Fitzgerald', '978-0743273565') book2 = Book('To Kill a Mockingbird', 'Harper Lee', '978-0446310789') book3 = Book('1984', 'George Orwell', '978-0451524935') ...

Design a simple Book Seller System with strategy pattern. (25 points) (a)You don’t care all the functions of the system. (b)There are three kinds of client which include VIPMember(0.9*price), NormalMember(1*price), SuperMember(0.8*price). They have the different discount when they buy book from the system. (c)You must use strategy pattern when you design the system. (d)Firstly, you should give the UML class diagram with the strategy pattern. (5 points) (e)Secondly, you should write the code for each class you design in the UML. (15 points) (f)Thirdly, you should write a class named Test which include a main() method, we support there are three clients named Tom(VIPMember), John(NormalMember) and Mike(SuperMember). The class you write can sell a book to the three clients. We support the price of the book is 150.(5 points)

2023-06-04 上传
- Calculate the price of a book based on the client's membership level (b) There are three kinds of clients: - VIPMember: gets a 10% discount (0.9 * price) - NormalMember: gets no discount (1 * price...

The library requires a class to store information about a book. Set up a class to hold data including title, author, year of publication, and a boolean variable to indicate if the book is in the library or if the book has been taken out. Create a method to load the data for one book. Create another method to display the data for a book. Create another method to check if a book is in the library or not. Write a main program to test your methods.

2023-05-25 上传
Here is a possible implementation of the book class and the main program: ```python class Book: def __init__(self, title, author, year, is_available): self.title = title self.author = author self...

Please summarize the main argument of the book <the culture of connectivity》

2023-03-28 上传
The main argument of the book "The Culture of Connectivity" is that the internet and other digital technologies have fundamentally transformed the way we communicate, interact, and understand ...

use java language ,In this project you need to write a book lending system for a Library. The system has different roles for registered users. There are two types of user roles: borrower and lender. Write an IUser interface for library users, with the following UML specification: +----------------------------------+ | <<interface>> | | IUser | +----------------------------------+ | + getName(): String | | + getBook(): int | | + moreBook(int number): void | +----------------------------------+ and a User class that implements IUser and has the following UML specification: +-----------------------------------+ | User | +-----------------------------------+ | - name: String | | - book: int | +-----------------------------------+ | + User(String name, int book) | | + getName(): String | | + getBook(): int | | # setBook(int book): void | | + moreBook(int number): void | | + testUser(): void | +-----------------------------------+ The name instance variable indicates the user name. The book instance variable indicates the number of books borrowed by the user. The setBook method changes the number of books borrowed by the user. The setBook method is protected, not public. This means that only subclasses of the User class can use the setBook method. All the other classes in the system cannot use the setBook method, so they cannot change the number of books borrowed by a user. The purpose of the moreBook method is to increase the number of books borrowed or lent by the user (depending on what kind of user it is) by the number given as argument to the method. The moreBook method of the User class is abstract, since we do not know what kind of role the user is (a borrower borrows books from other users and a lender lend books to other users). Also add to your program a Test class to test your User class. public class Test { public static void main(String[] args) { User.testUser(); } }

2023-05-25 上传
The setBook method is protected, meaning it can only be accessed by subclasses of User. The moreBook method is abstract, as its implementation will depend on the type of user (borrower or lender). ...

write java。The create method takes as arguments the name of a new library user, a number of books (as a string), and an integer representing the role of user to create (where the integer 0 means a lender and the integer 1 means a borrower). The create method of the controller then transforms the book number from a string to an integer (using the Integer.parseInt static method), creates an object from the correct class (based on the role specified by the user input: lender or borrower) and calls the addUser method of the library to add the new user object to the library. • If no exception occurs then the create method of the controller returns the empty string. • If the constructor of the Borrower class throws a NotALenderException then the create method of the controller must catch this exception and return as result the error message from the exception object. • If the parseInt method of the Integer class throws a NumberFormatException (because the user typed something which is not an integer) then the create method of the controller must catch this exception and return as result the error message from the exception object.

2023-05-24 上传
If the `parseInt` method of the `Integer` class throws a `NumberFormatException` (because the user typed something which is not an integer), the method catches the exception and returns an error ...

INSERT INTO BOOK VALUES (#BOOKID,#TITLE,#AUTHOR,#PUBLISHER,#PYEAR,#LANGUAGE);

2023-05-30 上传
这也是一个SQL语句，与上一个问题的语句相同，用于向数据库中的书籍表插入新...两个语句的区别在于第一个语句中的"BOOK"表示表名，而第二个语句中的"BOOK"表示字段列表，字段列表需要与表中的字段顺序和数量一一对应。

Please define a class Book and its data members and member functions ，according to the following description.Don’t implement any member functions. (1) Each book has a title, one or more authors, and an international standard book number (ISBN). (2) Class Book has two constructor: (a) the first should be a default constructor, (b) the second should take two arguments: the title and the ISBN. (3) The authors can be added one by one. (4) For the title and ISBN of a Book，a “set”function and a “get” function are required，Each “set ”function undates the corresponding data member to a new value through its parameters and each “get”function returns the value of the corresponding data member to caller.

2023-06-12 上传
Here is an example implementation of the Book class: ```c++ class Book { private: string title; // the book title vector<string> authors; // the book authors string isbn; // the book ISBN public:...

he user can type in the text field t the name of a library user. For example: When the user then clicks on the button, the action listener of the button must read the name of the library user that was typed in the text field (using the getText method of the text field) and must call the getBook method of the controller with that user name as argument. The getBook method of the controller returns a string as result which must then be displayed back to the user using a message dialog (using the showMessageDialog method of the JOptionPane class).

2023-05-24 上传
In this example, `button` is the JButton that the user clicks to get the book, `textField` is the JTextField where the user types the name of the library user, and `controller` is an instance of the ...
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