static void Main()
{
//public delegate bool Predicate<in T>(T obj);
//Predicate<int> evenLogic = (x) => x % 2 == 0;
//public delegate TResult Func<in T, out TResult>(T arg);
Func <int, bool> oddlogic = (num) => num % 2 != 0;
List <int> numbers = new List <int> {
1, 3, 4, 2, 6, 5, 9, 7, 0, 8
};
//Method query syntax
//var resultOP = numbers.Where(oddlogic).OrderBy(num => num).ToList<int>();
//query syntax
var resultOP = from num in numbers
where num % 2 == 0
orderby num ascending
select num;
foreach (int item in resultOP)
{
Console.WriteLine(item);
}
//2. create an object of delegate and pass the function to the constructor of the delegate
Logic logicCls = new Logic();
//logic.IsEven()
//LogicDel oddLogic = new LogicDel(logic.IsLessrThanThree);
//bool isEven = evenLogic.Invoke(12);
//Console.WriteLine(isEven);
//LogicDel logic = public bool IsGreaterThanFour(int number)
//{
// return number > 4;
//};
//anonymous method
//LogicDel logic = delegate (int number)
//{
// return number > 4;
//};
//anonymous method through Lambda Expression
// (args) =>(expression) <-- Lambda operator
LogicDel <int, bool> logic = (number) => number > 4;
//var result = Filter(numbers, oddLogic);
var result = Filter(numbers, logic);
foreach (int item in result)
{
Console.WriteLine(item);
}
}
static List <int> Filter(List <int> input, LogicDel <int, bool> logic)
{
List <int> result = new List <int>();
foreach (int item in input)
{
bool status = logic(item);
if (status)
{
result.Add(item);
}
}
return(result);
}
