davidelettieri

public class Result { 
	public bool Success {get;}
	public string Message {get;}
	
	public Result(bool success, string message) {
	Success = success;
	Message = message;
	}
}

davidelettieri

bool ValidateEmail(Customer c) { /**/ }
bool ValidateNameSurname(Customer c) { /**/ }
bool SendEmail(Customer c) { /**/ }
bool SendEmailToCustomerIfValid(Customer c) { 
    if(!ValidateNameSurname(c))
        return false;

    if(!ValidateEmail(c))
        return false;

davidelettieri

public class Order
{
    private List<OrderItem> _items;
    public List<OrderItem> GetItems() => new List<OrderItem>(_items);

    public void Add(OrderItem item)
    {
        _items.Add(item);
    }

davidelettieri

public class Order
{
    public bool IsPaid { get; set; }

    private List<OrderItem> _items;
    public List<OrderItem> GetItems() => new List<OrderItem>(_items);

    public void Add(OrderItem item)
    {
        if (IsPaid)

davidelettieri

Union<int, None> a = new Union<int, None>(1);
Union<int, None> b = new Union<int, None>(new None());

// Here we are saying:
// if a (or b) contains an int, add 1 to the value and return the result
// if a (or b) contains None, just return 0 as a default value
var c = a.Match(v => v + 1, _ => 0); // this is 2
var d = b.Match(v => v + 1, _ => 0); // this is 0

davidelettieri

public class Union<TOne, TOther>
{
    private readonly TOne _toneValue;
    private readonly TOther _totherValue;
    private readonly UnionType _type;

    public Union(TOne value)
    {
        _toneValue = value;
        _type = UnionType.TOne;

davidelettieri

int? a = 1;
int? b = null;

bool ba = a.HasValue; // true
bool bb = b.HasValue; // false

int c = b.Value + 1; // throws

davidelettieri

public class Union<TOne, TOther>
{
    private readonly TOne _toneValue;
    private readonly TOther _totherValue;

    public Union(TOne value) => _toneValue = value;
    public Union(TOther value) => _totherValue = value;
}

davidelettieri

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;

namespace TestEnumSerialization
{
    class Program
    {
        static void Main(string[] args)
        {

davidelettieri

public class Foo
{
    public int Value { get; set; }

    public override string ToString()
    {
        return $"{{{nameof(Value)}={Value.ToString()}}}";
    }
}