static void Main(string[] args)
{
// args => express // LambdaExpress
// number => number*number;
Func <int, int> square = number => number * number; // first int is the argument data type, the second int is the return value datatype
Console.WriteLine(square(5));
// () => ... || x => .... || (x, y, z) => ...
const int factor = 5;
Func <int, int> multipler = n => n * factor;
var result = multipler(10);
Console.WriteLine(result);
// Not LanbdaExpression
List <Book> books = new BookRespository().GetBooks();
List <Book> cheapBooks = books.FindAll(IsCheaperThan10Dollars);
foreach (var book in cheapBooks)
{
Console.WriteLine(book.Title);
Console.WriteLine(book.Price);
}
// with LanbdaExpression
List <Book> books0 = new BookRespository().GetBooks();
List <Book> cheapBooks0 = books0.FindAll(book => book.Price < 10);
}
public BookController()
{
_bookRespository = new BookRespository();
}