public void BindDemo()
{
// Int.Parse is a function from LaYumba. It takes a string and returns an Option<int>.
// Int.Parse: s -> Option<int>
var optI = Int.Parse("12");
// Age.Of: int -> Option<Age>
// Age.Of(1)
// Combination with Map:
var ageOpt = optI.Map(i => Age.Of(i));
// Problem: returns Option<Option<Age>> ARRGH!
var ageOpt1 = optI.Map(i => Age.Of(i));
// Solution: Bind instead of Map when combining functions which return M<T>
Func <string, Option <Age> > parseAge = s
=> Int.Parse(s).Bind(Age.Of);
var ageO = parseAge("12");
ageO.Match(
() => true.Should().Be(false), // <- ensure that this path is never called!
x => x.Value.Should().Be(12)
);
}
public void Age_has_smart_ctor()
{
// TODO Create readable test extension for Option
Age.Of(10).Match(
() => true.Should().Be(false),
age => age.Value.Should().Be(10));
Age.Of(-1).Match(
() => true.Should().Be(true),
age => age.Should().Be(null));
}
public void Using_a_smart_ctor_works()
{
var optAge = Age.Of(10);
optAge.Should().BeOfType <Option <Age> >();
}