static void Main(string[] args)
{
//arguments => expresion
//No arguments, () => ...
//one arguments we can avoid using parenthesis, x => ...
//More than one arguments we have to use parenthesis, (x,y) => ...
Func <int, int> square = number => number * number;
Console.WriteLine(square(5));
//Scope
const int factor = 5;
Func <int, int> multipler = n => n * factor;
int result = multipler(10);
//Way 1 - Using Predicate functions
var books = new BookRepository().GetBooks();
var cheapBooks1 = books.FindAll(IsCheaperThan10);
foreach (var book in cheapBooks1)
{
Console.WriteLine(book.Title);
}
//Way 2 - Using lambda expression and LINQ
BookRepository bookRepository = new BookRepository();
List <Book> cheapBooks2 = (bookRepository.GetBooks()).Where(book => book.Price < 10).ToList();
Console.WriteLine("--------------------");
foreach (var book in cheapBooks2)
{
Console.WriteLine(book.Title);
}
//Way 3 - Using Lambda expression
var books3 = new BookRepository().GetBooks();
var cheapBooks3 = books3.FindAll(b => b.Price < 10);
Console.WriteLine("--------------------");
foreach (var book in cheapBooks3)
{
Console.WriteLine(book.Title);
}
}
public static void Main()
{
// Making use of the private constant defined earlier.
//Func<int, int> square = n => n * _factor;
//Console.WriteLine(square(5));
var repository = new BookRepository();
// 1. Without Lambda expressions
var books = repository.GetBooks();
// Call a predicate to return the books
// var cheapbooks = books.FindAll(FindCheapBooks);
// Add a Lambda expression instead
var cheapbooks = books.FindAll(b => b.Price < 10);
foreach (var book in cheapbooks)
{
Console.WriteLine(book.Title);
}
}
// static void Main(string[] args)
// {
// // args => expression
// int factor = 5;
//
// Func<int, int> square = number => number * number;
// Func<int, int> multiple = number => factor * number;
// square = Square;
// Console.WriteLine(square(10));
// Console.WriteLine(multiple(45));
// }
static void Main(String[] args)
{
var books = BookRepository.GetBooks();
// var cheapBooks = books.FindAll(IsCheaperThan10Dollars);
// var cheapBooks = books.FindAll(book => book.Price < 10);
// foreach (var book in cheapBooks)
// {
// Console.WriteLine(book.Title + " " + book.Price);
// }
// linq expressions
var cheapBooks = books
.Where(b => b.Price < 10)
.OrderBy(book => book.Title)
.Select(book => book.Title);
var cheapBooksOperator = from b in books
where (b.Price < 10)
orderby(b.Title)
select(b.Title);
var booksOrderedByTitle = books.OrderBy(book => book.Title);
}
