public static Result<decimal, string> CostToEnter(Person p)
{
return from a in Club.CheckAge(p)
from b in Club.CheckClothes(a)
from c in Club.CheckSobriety(b)
select c.Gender == Gender.Female ? 0m : 5m;
}
public static Result<Person, string> CheckClothes(Person p)
{
if (p.Gender == Gender.Male && !p.Clothes.Contains("Tie"))
return Result<Person, string>.FailWith("Smarten up!");
if (p.Gender == Gender.Female && p.Clothes.Contains("Trainers"))
return Result<Person, string>.FailWith("Wear high heels!");
return Result<Person, string>.Succeed(p);
}
public static Result<Person, string> CheckAge(Person p)
{
if (p.Age < 18)
return Result<Person, string>.FailWith("Too young!");
if (p.Age > 40)
return Result<Person, string>.FailWith("Too old!");
return Result<Person, string>.Succeed(p);
}
public void Part1()
{
var Dave = new Person(Gender.Male, 41, new List<string> { "Tie", "Jeans" }, Sobriety.Sober);
var costDave = ClubbedToDeath.CostToEnter(Dave);
Assert.AreEqual("Too old!", costDave.FailedWith().First());
var Ken = new Person(Gender.Male, 28, new List<string> { "Tie", "Shirt" }, Sobriety.Tipsy);
var costKen = ClubbedToDeath.CostToEnter(Ken);
Assert.AreEqual(5m, costKen.SucceededWith());
var Ruby = new Person(Gender.Female, 25, new List<string> { "High heels" }, Sobriety.Tipsy);
var costRuby = ClubbedToDeath.CostToEnter(Ruby);
costRuby.Match(
(x, msgs) =>
{
Assert.AreEqual(0m, x);
},
msgs =>
{
Assert.Fail();
});
var Ruby17 = new Person(Ruby.Gender, 17, Ruby.Clothes, Ruby.Sobriety);
var costRuby17 = ClubbedToDeath.CostToEnter(Ruby17);
Assert.AreEqual("Too young!", costRuby17.FailedWith().First());
var KenUnconscious = new Person(Ken.Gender, Ken.Age, Ken.Clothes, Sobriety.Unconscious);
var costKenUnconscious = ClubbedToDeath.CostToEnter(KenUnconscious);
costKenUnconscious.Match(
(x, msgs) =>
{
Assert.Fail();
},
msgs =>
{
Assert.AreEqual("Sober up!", msgs.First());
});
}
public static Result<Person, string> CheckSobriety(Person p)
{
if (new[] { Sobriety.Drunk, Sobriety.Paralytic, Sobriety.Unconscious }.Contains(p.Sobriety))
return Result<Person, string>.FailWith("Sober up!");
return Result<Person, string>.Succeed(p);
}
public void Part3()
{
var person = new Person(
gender: Gender.Male,
age: 59,
clothes: new List<string> { "Jeans" },
sobriety: Sobriety.Paralytic);
var cost = GayBar.CostToEnter(person);
cost.Match(
ifSuccess: (x, msgs) => Assert.Fail(),
ifFailure: errs => Assert.That(errs, Is.EquivalentTo(new[] { "Too old!", "Smarten up!", "Sober up!" })));
}
public static Result<decimal, string> CostToEnter(Person p)
{
return new List<Func<Person, Result<Person, string>>> { CheckGender, Club.CheckAge, Club.CheckClothes, Club.CheckSobriety }
.Select(check => check(p))
.Collect()
.Select(x => x[0].Age + 1.5m);
}
public static Result<Person, string> CheckGender (Person p)
{
if (p.Gender == Gender.Male)
return Result<Person, string>.Succeed(p);
return Result<Person, string>.FailWith("Men only");
}
public void Part2()
{
var daveParalytic = new Person(
age: 41,
clothes: new List<string> { "Tie", "Shirt" },
gender: Gender.Male,
sobriety: Sobriety.Paralytic);
var costDaveParalytic = ClubTropicana.CostToEnter(daveParalytic);
costDaveParalytic.Match(
ifSuccess: (x, msgs) => Assert.Fail(),
ifFailure: errs => Assert.That(errs.ToList(), Is.EquivalentTo(new[] { "Too old!", "Sober up!" })));
}
public static decimal CostByGender(Person p, Person x, Person y)
{
return p.Gender == Gender.Female ? 0m : 7.5m;
}
public static Result<decimal, string> CostToEnter(Person p)
{
return from c in Club.CheckAge(p)
join x in Club.CheckClothes(p) on 1 equals 1
join y in Club.CheckSobriety(p) on 1 equals 1
select c.Gender == Gender.Female ? 0m : 7.5m;
}