display(new [] {"hello", "world"} );

Enumerable.Range(1, 5)

var dictionary = new Dictionary<string, int>
{
  ["zero"] = 0,
  ["one"] = 1,
  ["two"] = 2
};
dictionary

class Person 
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; } 
}

display(new Person { FirstName = "Mitch", LastName = "Buchannon", Age = 42} );

var groupOfPeople = new [] 
{
    new Person { FirstName = "Mitch", LastName = "Buchannon", Age = 42 },
    new Person { FirstName = "Hobie ", LastName = "Buchannon", Age = 23 },
    new Person { FirstName = "Summer", LastName = "Quinn", Age = 25 },
    new Person { FirstName = "C.J.", LastName = "Parker", Age = 23 },
};

display(groupOfPeople);

display(groupOfPeople.ToDictionary(p => $"{p.FirstName}"));

class Person 
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; } 
    public List<Person> Friends { get; } = new List<Person>();
}


var mitch = new Person { FirstName = "Mitch", LastName = "Buchannon", Age = 42 };
var hobie = new Person { FirstName = "Hobie ", LastName = "Buchannon", Age = 23 };
var summer = new Person { FirstName = "Summer", LastName = "Quinn", Age = 25 };
var cj = new Person { FirstName = "C.J.", LastName = "Parker", Age = 23 };

mitch.Friends.AddRange(new [] { hobie, summer, cj });
hobie.Friends.AddRange(new [] { mitch, summer, cj });
summer.Friends.AddRange(new [] { mitch, hobie, cj });
cj.Friends.AddRange(new [] { mitch, hobie, summer });

var groupOfPeople = new List<Person> { mitch, hobie, summer, cj };

display(groupOfPeople);

using Microsoft.DotNet.Interactive.Formatting;

Formatter.Register<Person>((person, writer) => {
   writer.Write("person");
}, mimeType: "text/plain");

groupOfPeople

Formatter.ResetToDefault();

Formatter.Register<Person>((person, writer) => {
   writer.Write(person.FirstName);
}, mimeType: "text/plain");

groupOfPeople

using static Microsoft.DotNet.Interactive.Formatting.PocketViewTags;
    
Formatter.ResetToDefault();
Formatter.Register<List<Person>>((people, writer) => 
{
    foreach (var person in people)
    {
        writer.Write(
            span(
                b(person.FirstName), 
                " ",
                i($"({person.Age} years old and has {person.Friends.Count} friends)"),
                br));
    }
}, mimeType: "text/html");

groupOfPeople