CSharp-learning/C# Full Course for free/15.List.md

List

data structure that represents a list of objects that can be accessed by index. Similar to array, but can dynamically increase/decrease in size using System.Collection.Generic

// error with array
String[] food = new string[3];

food[0] = "pizza";
food[1] = "hamburger";
food[2] = "hotdog";
food[3] = "Salad";

foreach(String item in food)
{
    Console.WriteLine(item);
}

using System.Collection.Generic

List<String> food = new List<String>();

food.Add("fries");
food.Add("pizza");
food.Add("hamburger");
food.Add("hotdog");
food.Add("Salad");
food.Add("fries");

foreach(String item in food)
{
    Console.WriteLine(item);
}

// accessing an element
Console.WriteLine(food[1]);

food.Remove("fries");

food.Insert(0,"sushie");

Console.WriteLine(food.Count());

Console.WriteLine(food.IndexOf("hotdog"));
Console.WriteLine(food.LastIndexOf("fries"));
Console.WriteLine(food.Cotains("pizza"));
food.Sort();
food.Reverse();
food.Clear();
String[] foodArray  = food.ToArray();
food.Clear();

List of object

List<Player> player = new List<Player>();

Player player1 = new Player ("Chad")
Player player2 = new Player ("Steve")
Player player3 = new Player ("Karen")


players.Add(player1);
players.Add(player2);
players.Add(player3);

// or anonymously

players.Add(new Player ("Karen"));
players.Add(new Player ("Chad"));
players.Add(new Player ("Steve"));

foreach(Player player in players)
{
    Console.WriteLine(player);
}

class Player
{
    public string username;
    
    public Player(String username)
    {
        this.username=username;
    }

    public override string ToString()
    {
        return username;
    
    }
}