csharp_collections

gistfile1.txt

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

class Program
{
    static void Main(string[] args)
    {
        // Example 1. Simple List
        List<float> floatList = new List<float> { 1.1f, 2.2f, 3.3f, 4.4f, 5.5f };
        foreach (float value in floatList)
        {
            Console.WriteLine(value);
        }


        // Example 2. Dictionary vs SortedList
        // Examples from CME BTC futures https://www.cmegroup.com/markets/cryptocurrencies/bitcoin/bitcoin.quotes.html#venue=globex
        List<string> futureCodes = new List<string>
        {
            "BTCU25", "BTCZ25", "BTCH24", "BTCQ24", "BTCU24", "BTCZ24", "BTCH25", "BTCJ24", "BTCK24", "BTCM24", "BTCN24"
        };

        // https://www.tutorialsteacher.com/csharp/csharp-sortedlist
        Dictionary<int, Future> futuresDictionary = new Dictionary<int, Future>();
        SortedList<int, Future> sortedFutures = new SortedList<int, Future>();

        foreach (string futureCode in futureCodes)
        {
            Future future = new Future(futureCode);
            futuresDictionary.Add(future.NumDaysToMaturity, future);
            sortedFutures.Add(future.NumDaysToMaturity, future);
        }

        foreach (KeyValuePair<int, Future> kvp in futuresDictionary)
        {
            Console.WriteLine($"NumDaysToMaturity: {kvp.Key}, Future: {kvp.Value.FutureCode}");
        }
        
        foreach (KeyValuePair<int, Future> kvp in sortedFutures)
        {
            Console.WriteLine($"NumDaysToMaturity: {kvp.Key}, Future: {kvp.Value.FutureCode}");
        }
    }
}

class Future
{
    public string FutureCode { get; }
    public string Token { get; private set; }
    public string MonthCode { get; private set; }
    public int Month { get; private set; }
    public int Year { get; private set; }

    public Future(string futureCode)
    {
        FutureCode = futureCode;
        string futureCodePattern = @"^(?<token>[A-Z]{3})(?<futureMonthCode>[A-Z])(?<year>\d{2})$";
        Match futureCodeMatch = Regex.Match(futureCode, futureCodePattern);
        if (futureCodeMatch.Success)
        {
            Token = futureCodeMatch.Groups["token"].Value;
            MonthCode = futureCodeMatch.Groups["futureMonthCode"].Value;
            Month = GetMonthFromCode(MonthCode);
            Year = Convert.ToInt32(futureCodeMatch.Groups["year"].Value) + 2000; // Assuming years are in 20XX format
        }
    }

    public int NumDaysToMaturity
    {
        get
        {
            DateTime today = DateTime.Today;
            DateTime maturityDate = new DateTime(Year, Month, DateTime.DaysInMonth(Year, Month));
            return (int)(maturityDate - today).TotalDays;
        }
    }

    private int GetMonthFromCode(string monthCode)
    {
        switch (monthCode)
        {
            case "F": return 1; // January
            case "G": return 2; // February
            case "H": return 3; // March
            case "J": return 4; // April
            case "K": return 5; // May
            case "M": return 6; // June
            case "N": return 7; // July
            case "Q": return 8; // August
            case "U": return 9; // September
            case "V": return 10; // October
            case "X": return 11; // November
            case "Z": return 12; // December
            default: throw new ArgumentException("Invalid month code");
        }
    }
}