Collections.dib

#!markdown

# Collections

#!markdown

### Generics vs Non-generics

#!csharp

ArrayList list1 = new ArrayList();

list1.Add(1);
list1.Add(5);
list1.Add("test");
list1.Add(new { Name = "A", LastName = "B"});
list1.Add(new ArrayList());
list1[2] = "aaaa";

display(list1);

#!csharp

int value = list1[0];
display(value);

#!csharp

int value = (int)list1[0];
display(value);

#!csharp

List<int> list1 = new List<int>();

list1.Add(1);
list1.Add(5);

display(list1);

#!csharp

list1.Add("test");

#!csharp

int value = list1[0];
display(value);

#!markdown

### List

#!csharp

var list = new List<int>();
list.Add(1);
list.Add(5);
list.Add(10);

display(list);

#!csharp

var list = new List<int>() { 5, 1, 10 };
display(list);

#!csharp

list.Sort();
display(list);

#!csharp

display(list.Contains(5));
display(list.Contains(10));
display(list.Contains(3));

#!csharp

display(list.IndexOf(5));
display(list.IndexOf(10));
display(list.IndexOf(3));

#!csharp

list.Add(11);
display(list);

#!csharp

list.Remove(5);
display(list);

#!csharp

display(list.Count);
display(list[0]);
display(list[2]);

list[0] = 8;
display(list);

#!csharp

LinkedList<int> llist = new LinkedList<int>();
llist.AddLast(1);
llist.AddLast(5);

display(llist);

Stack<int> s = new Stack<int>();

#!markdown

### Dictionary

#!csharp

var dict = new Dictionary<string, int>();
dict.Add("key1", 1);
dict.Add("key2", 5);
dict.Add("key3", 7);

display(dict);

#!csharp

var dict = new Dictionary<string, int>()
{
    { "key1", 1 },
    { "key2", 5 },
    { "key3", 7 }
};

display(dict);

#!csharp

dict.Add("key1", 2);

#!csharp

display(dict.ContainsKey("key1"));
display(dict.ContainsKey("key3"));
display(dict.ContainsKey("key8"));

#!csharp

display(dict["key1"]);
display(dict["key3"]);

dict["key1"] = 7;

display(dict);

Dictionary<string, List<int>> dict2 = new Dictionary<string, List<int>>();

#!csharp

display(dict["key9"]);

#!csharp

if (dict.ContainsKey("key9"))
{
    display(dict["key9"]);
}
else
{
    display("No such key");
}

#!csharp

int value = 0;
display(dict.TryGetValue("key9", out value));
display(value);