using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        IComparableExtensionExamples();

    }

    private static void IComparableExtensionExamples()

    {

        int age = 29;

​

        Console.WriteLine($"{age,-3} is over 30 {age.Between(30, 30).ToYesNo()}");

​

        age = 31;

        Console.WriteLine($"{age,-3} is over 30 {age.Between(30, 31).ToYesNo()}");

​

        age = 12;

        Console.WriteLine($"is child {age.IsChild().ToYesNo()}");

​

        DateTime lowDateTime = new(2022, 1, 1);

        DateTime someDateTime = new(2022, 1, 2);

        DateTime highDateTime = new(2022, 1, 8);

​

        Console.WriteLine($"{someDateTime:d} between {lowDateTime:d} and {highDateTime:d}? {someDateTime.Between(lowDateTime, highDateTime).ToYesNo()}");

​

        someDateTime = new DateTime(2022, 2, 2);

        Console.WriteLine($"{someDateTime:d} between {lowDateTime:d} and {highDateTime:d}? {someDateTime.Between(lowDateTime, highDateTime).ToYesNo()}");

​

        Console.WriteLine($"30.IsOver30() {30.IsOver30()}");

        Console.WriteLine($"31.IsOver30() {31.IsOver30()}");

    }   

}

​

public static class GenericExtensions

{

    public static bool Between<T>(this T value, T lowerValue, T upperValue) 

        where T : struct, IComparable<T> 

            => Comparer<T>.Default.Compare(value, lowerValue) >= 0 && 

            Comparer<T>.Default.Compare(value, upperValue) <= 0;

​

    public static bool BetweenExclusive<T>(this IComparable<T> sender, T minimumValue, T maximumValue) 

        => sender.CompareTo(minimumValue) > 0 && sender.CompareTo(maximumValue) < 0;

​

    public static bool IsGreaterThan<T>(this T sender, T value) where T : IComparable

        => sender.CompareTo(value) > 0;

​

    public static bool IsLessThan<T>(this T sender, T value) where T : IComparable 

        => sender.CompareTo(value) < 0;

​

    public static bool IsChild(this int sender)

        => sender.Between(1, 12);

​

    public static bool IsOver30(this int sender) => sender.IsGreaterThan(30);

    public static string CaseWhen(this int sender)

    {

        return sender switch

        {

                { } value1 and >= 7 and <= 14 => $"I am 7 or above but less than 14: {value1}",

                { } value2 when value2.Between(4, 6) => $"I am between 4 and 6: {value2}",

                { } value3 when (value3.IsLessThan(3)) => $"I am 3 or less: {value3}",

                _ => "I'm old"

        };

    }

​

}

​

    public static class StringExtensions

    {

        public static string ToYesNo(this bool value)

            => value ? "Yes" : "No";

    }