public Validator <T> Validate <U>(Func <T, U> projection,
Predicate <U> validation,
string message)
{
//return Validate(t => validation(projection(t)), message);
return(Validate(projection.AndThen(validation), message));
}
public void AndThen()
{
Func <int, long> plus2 = a => a + 2;
Func <string, int> length = s => s.Length;
Func <string, long> lengthPlus2 = length.AndThen(plus2);
Assert.AreEqual(5, lengthPlus2("abc"));
}
public void AndThen_Executes_Functions_In_Correct_Order()
{
Func <int, int> add1 = x => x + 1;
Func <int, int> doubleValue = x => x * 2;
Func <int, int> add1AndDoubleValue = add1.AndThen(doubleValue);
add1AndDoubleValue(5).ShouldBe(12);
}
public void Test_Func_AndThen()
{
Func <string, string> first = input => input + "1";
Func <string, string> second = input => input + "2";
Func <string, string> composed = first.AndThen(second);
string result = composed("0");
Assert.Equal("012", result);
}
public void GivenALisOfItemHolds_WhenCalculateTotalCostCalled_ThenReturnsTotalCostWithSeviceTaxApplied()
{
// Arrange
var items = new List <ItemHolder>()
{
new ItemHolder("1", 10, 50),
new ItemHolder("2", 1, 500),
new ItemHolder("3", 5, 100)
};
Func <List <ItemHolder>, double> totalCalculator = SuperMarket.CalculateTotalCost;
var costCalculator = totalCalculator.AndThen(SuperMarket.CalculateServiceTax(12.5));
// Act
var totalCost = costCalculator(items);
// Assert
Assert.That(totalCost, Is.EqualTo(1687.5));
}
public ICoreStatBuilder Resolve(ResolveContext context) =>
new BuffCoreStatBuilder(
_buffs.Select(b => b.Resolve(context)).ToList(),
_statFactory.AndThen(b => b.Resolve(context)),
_restrictionsBuilder.Resolve(context));
public ICoreStatBuilder Resolve(ResolveContext context)
=> new StatBuilderWithValueConverter(_inner.Resolve(context), _entity,
_createValue.AndThen(b => b.Resolve(context)), _combineValues);
public void GivenEmptyCartProductWithBuyXAndGetYOffer_When5ProductsAdded_ThenReturnsExpectedTotalPriceAndDiscount()
{
// Arrange
var doveProduct = new Product("Dove Soap", 39.99);
var offerBuy2Get1Free = new Func <IProduct, uint, IProduct>((p, q) =>
{
uint numberOfTimesToApply = q / 3;
if (numberOfTimesToApply > 0)
{
return(new DiscountAsProduct(
p.Name + " - Buy 2 Get 1 Free offer",
numberOfTimesToApply * p.UnitPrice));
}
return(new NullProduct());
});
var discountCalculator = new Func <IEnumerable <IProduct>, double>((products) =>
{
var discount = 0.0d;
var offerApplied = new List <IProduct>();
var enumerable = products.ToList();
foreach (var product in enumerable)
{
if (!(product is IProductWithAssociatedOffer productWithAssociatedOffer) || offerApplied.Contains(product))
{
continue;
}
var quantity = enumerable.Count(p => p.Name == product.Name);
discount -= productWithAssociatedOffer.GetOffer()(product, (uint)quantity).UnitPrice;
offerApplied.Add(product);
}
return(discount);
});
var priceCalculator = new Func <IEnumerable <IProduct>, double>((products) =>
{
var price = 0.0d;
var enumerable = products.ToList();
price = enumerable.Select(p => p.UnitPrice).Sum();
price -= discountCalculator(enumerable);
return(price);
});
var serviceTaxCalculator = new Func <double, double>((price) => price + price * 0.125);
var productWithOffer = new ProductWithAssociatedOffer(doveProduct, offerBuy2Get1Free);
var cart = new DiscountShoppingCart(
priceCalculator.AndThen(serviceTaxCalculator),
discountCalculator);
// Act
cart.AddProduct(productWithOffer, 3);
// Assert
Assert.That(cart.Products.Count(p => p.Name == "Dove Soap"), Is.EqualTo(3));
Assert.That(cart.GetTotalPrice(), Is.EqualTo(89.98));
Assert.That(cart.GetTotalDiscount(), Is.EqualTo(39.99));
}
/// <summary> /// Composes two functions together. /// (Outer with the value of the result of inner will be called, if the resulting function will be called) /// </summary> /// <param name="outer">The outer function</param> /// <param name="inner">The inner function</param> /// <typeparam name="T1">Type of the first input parameter</typeparam> /// <typeparam name="T2">Type of the second input parameter</typeparam> /// <typeparam name="T3">The result type of the resulting function</typeparam> /// <returns>The composed function</returns> public static Func <T1, T3> Compose <T1, T2, T3>(this Func <T2, T3> outer, Func <T1, T2> inner) => inner.AndThen(outer);