Sanchime.Functional/Sanchime.Test/Program.cs

using Sanchime.Functional.Products;
using Sanchime.Functional.Extensions;
using Sanchime.Toolkits;


try
{
    void foo(Option<int> option)
    {
        var res = option.Map(x => x + 2);
        res.WriteLine();
    }

    "预计打印Some(12)".WriteLine();
    foo(10);
    "预计打印None".WriteLine();
    foo(Optional.None);

    "预计打印Some(String)".WriteLine();
    Optional.Some(1)
        .Map(x => x + 1.2)
        .Map(x => x.ToString())
        .Map(x => x.GetType().Name)
        .WriteLine();

// 测试Option的Bind
    var parse = (string s) => Int32.TryParse(s, out int i) ? Optional.Some(i) : Optional.None;
    var foo1 = (string s) => s.Pipe(parse).Bind(Age.Of);
    "预计打印Some(111)".WriteLine();
    foo1("111").WriteLine();
    "预计打印None".WriteLine();
    foo1("aaa").WriteLine();
    "预计打印Some(123)".WriteLine();
    foo1("123").WriteLine();
// 管道
    "预计打印None".WriteLine();
    foo1("1ab").Pipe(x => x.WriteLine());
}
catch (Exception ex)
{
    ex.Message.WriteLine();
    ex.StackTrace.WriteLine();
}

public struct Age
{
    private int _value;

    public static Option<Age> Of(int age)
        => IsValid(age) ? Optional.Some(new Age(age)) : Optional.None;

    private Age(int age)
    {
        if (!IsValid(age))
        {
            throw new ArgumentException("输入的年龄是无效的");
        }
        _value = age;
    } 

    private static bool IsValid(int age)
        => age is (>= 0 and <= 150);

    public override string ToString()
        => _value.ToString();
}