public static void Ex2List()
{
var l1 = "[ 1 2 2.5 abc -5 14 ]".ToStringEnumF()
.Map(x => ToNatural(x))
.Filter(x => x.IsSome)
.Map(x => x.Value);
WriteLine(l1.ToStringF());
var o1 = ToNatural("1");
WriteLine(o1);
var o2 = ToNatural("abc");
WriteLine(o2);
var o3 = OptionF <OptionF <int> > .Some(o1);
WriteLine(o3);
var o4 = o3.Bind((OptionF <int> x) => x);
WriteLine(o4.ToStringF()); // [ 1 ]
var l2 = new OptionF <int>[] { o1, o2, o1, o2 }.AsEnumerable();
var l3 = l2.Filter(x => x.IsSome).Map(x => x.Value); // [ 1 1 ]
WriteLine(l3.ToStringF());
}
public static OptionF <Age> FromInt(int age)
{
if (age > 0 && age < 120)
{
return(OptionF <Age> .Some(new Age(age)));
}
else
{
return(OptionF <Age> .None());
}
}
private static OptionF <int> ToPassingGrade(int n)
{
if (n >= 5 && n <= 10)
{
return(OptionF <int> .Some(n));
}
else
{
return(OptionF <int> .None());
}
}
private static OptionF <string> StringNotNumber(string s)
{
if (double.TryParse(s, out double d))
{
return(OptionF <string> .None());
}
else
{
return(OptionF <string> .Some(s));
}
}
private static OptionF <double> ToRealNumber(string s)
{
bool ok = double.TryParse(s, out double result);
if (ok)
{
return(OptionF <double> .Some(result));
}
else
{
return(OptionF <double> .None());
}
}
private static OptionF <int> ToNatural(string s)
{
bool ok = Int32.TryParse(s, out int result);
if (!ok)
{
return(OptionF <int> .None());
}
else if (result >= 0)
{
return(OptionF <int> .Some(result));
}
else
{
return(OptionF <int> .None());
}
}
/// <summary>
/// Initializes a new instance of the ExpertMatchF class.
/// </summary>
/// <param name="option">An option object that will be used for pattern matching.</param>
public ExpertMatchF(OptionF <T> option)
{
_option = option;
}
