public void FuncTest()
{
bool isExecuted1 = false;
Func <int, int> addOne = x => { isExecuted1 = true; return(x + 1); };
Func <int> query1 = FuncExtensions.Func(addOne).Apply(2.Func());
Assert.IsFalse(isExecuted1); // Deferred and lazy.
Assert.AreEqual(addOne(2), query1()); // Execution.
Assert.IsTrue(isExecuted1);
// f.Functor().Apply(F) == F.Select(f)
Assert.AreEqual(FuncExtensions.Func(addOne).Apply(1.Func())(), 1.Func().Select(addOne)());
// id.Functor().Apply(F) == F
Func <int, int> id = Functions.Id;
Assert.AreEqual(FuncExtensions.Func(id).Apply(1.Func())(), 1.Func()());
// o.Functor().Apply(F1).Apply(F2).Apply(F3) == F1.Apply(F2.Apply(F3))
Func <int, int> addTwo = x => x + 2;
Func <int> left1 = FuncExtensions.Func(Functions <int, int, int> .o).Apply(FuncExtensions.Func(addOne)).Apply(FuncExtensions.Func(addTwo)).Apply(1.Func());
Func <int> right1 = FuncExtensions.Func(addOne).Apply(FuncExtensions.Func(addTwo).Apply(1.Func()));
Assert.AreEqual(left1(), right1());
// f.Functor().Apply(a.Functor()) == f(a).Functor()
Assert.AreEqual(FuncExtensions.Func(addOne).Apply(1.Func())(), addOne(1).Func()());
// F.Apply(a.Functor()) == (f => f(a)).Functor().Apply(F)
Func <int> left2 = FuncExtensions.Func(addOne).Apply(1.Func());
Func <int> right2 = FuncExtensions.Func(new Func <Func <int, int>, int>(f => f(1))).Apply(FuncExtensions.Func(addOne));
Assert.AreEqual(left2(), right2());
}
public void FuncTest2()
{
bool isExecuted1 = false;
Func <int, Func <int, string> > add = x => y =>
{ isExecuted1 = true; return((x + y).ToString(CultureInfo.InvariantCulture)); };
Func <string> query2 = FuncExtensions.Func(add).Apply(1.Func()).Apply(2.Func());
Assert.IsFalse(isExecuted1); // Deferred and lazy.
Assert.AreEqual(add(1)(2), query2()); // Execution.
Assert.IsTrue(isExecuted1);
// f.Functor().Apply(F) == F.Select(f)
Assert.AreEqual(FuncExtensions.Func(add).Apply(1.Func())()(2), 1.Func().Select(add)()(2));
// id.Functor().Apply(F) == F
Func <int, int> id = Functions.Id;
Assert.AreEqual(FuncExtensions.Func(id).Apply(1.Func())(), 1.Func()());
// o.Functor().Apply(F1).Apply(F2).Apply(F3) == F1.Apply(F2.Apply(F3))
Func <Func <int, string>, Func <int, int> > length = f => x => f(x).Length;
Func <Func <int, int> > left1 = FuncExtensions.Func(Functions <int, Func <int, string>, Func <int, int> > .o).Apply(FuncExtensions.Func(length)).Apply(FuncExtensions.Func(add)).Apply(1.Func());
Func <Func <int, int> > right1 = FuncExtensions.Func(length).Apply(FuncExtensions.Func(add).Apply(1.Func()));
Assert.AreEqual(left1()(2), right1()(2));
// f.Functor().Apply(a.Functor()) == f(a).Functor()
Assert.AreEqual(FuncExtensions.Func(add).Apply(1.Func())()(2), FuncExtensions.Func(add(1))()(2));
// F.Apply(a.Functor()) == (f => f(a)).Functor().Apply(F)
Func <Func <int, string> > left2 = FuncExtensions.Func(add).Apply(1.Func());
Func <Func <int, string> > right2 = FuncExtensions.Func(new Func <Func <int, Func <int, string> >, Func <int, string> >(
f => f(1))).Apply(FuncExtensions.Func(add));
Assert.AreEqual(left2()(2), right2()(2));
bool isExecuted3 = false;
Func <string> consoleReadLine1 = () => "a";
Func <string> consoleReadLine2 = () => "b";
Func <string, Func <string, string> > concat = x => y =>
{ isExecuted3 = true; return(string.Concat(x, y)); };
Func <string> concatLines = FuncExtensions.Func(concat).Apply(consoleReadLine1).Apply(consoleReadLine2);
Assert.IsFalse(isExecuted3); // Deferred and lazy.
Assert.AreEqual(string.Concat(consoleReadLine1(), consoleReadLine2()), concatLines());
Assert.IsTrue(isExecuted3);
}