using System;

using System.Collections.Generic;

using System.Globalization;

​

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("IsPositive");

        int value = -2;

        Console.WriteLine($"int {value} is positive {value.IsPositive().ToYesNoString()}");

        value = 2;

        Console.WriteLine($"int {value} is positive {value.IsPositive().ToYesNoString()}");

        double dValue = -2;

        /*

        * This reports wrong here but in Visual Studio reports correctly

        */      

        Console.WriteLine($"double {dValue} is positive {value.IsPositive().ToYesNoString()}");

​

        dValue = 2;

        Console.WriteLine($"double {dValue} is positive {value.IsPositive().ToYesNoString()}");

        Console.WriteLine("---");

        Console.WriteLine("GetRange");

        var list = new List<string> { "abc", "def", "ghi" };

        Range range = new Range(0, ^1);

        List<string> subList1 = list.GetRange(range);

        List<string> subList = list.GetRange(0..1);

        Console.WriteLine($"{string.Join(",", subList1.ToArray())}");

        Console.WriteLine($"{string.Join(",", subList.ToArray())}");        

        Console.WriteLine("---");

        Console.WriteLine("ToDateTime");        

        TimeSpan timeSpan = new TimeSpan(1, 13, 3, 0);

        DateTime dateTime = timeSpan.ToDateTime();

        Console.WriteLine(dateTime);

    }

}

/*

* Random generic extensions

*/

public static class GenericExtensions

{

    public static bool IsPositive<T>(this T value)  where T : struct, IComparable<T> => value.CompareTo(default(T)) > 0;

    public static bool IsNegative<T>(this T value) where T : struct, IComparable<T> =>  value.CompareTo(default(T)) == -1;      

    public static string ToYesNoString(this bool value) => value ? "Yes" : "No";        

    public static DateTime ToDateTime(this TimeSpan sender) => DateTime.ParseExact(sender.Formatted("hh:mm"), "H:mm", null, DateTimeStyles.None);   

    public static string Formatted(this TimeSpan sender, string format = "hh:mm tt") => DateTime.Today.Add(sender).ToString(format);    

    public static List<T> GetRange<T>(this List<T> list, Range range)

    {

        var(start, length) = range.GetOffsetAndLength(list.Count);

        return list.GetRange(start, length);

    }

}