簡介

該庫有助于以更實用的方式編寫代碼

安裝

在NuGet上可用

dotnet add package CSharpFunctionalExtensions

或者

PM> Install-Package CSharpFunctionalExtensions

例子

Maybe

創建一個值

Maybe<string>?apple?=?Maybe<string>.From("apple");//?orMaybe<string>?apple?=?Maybe.From("apple");?//?type?inference//?orvar?apple?=?Maybe.From("apple");

GetValueOrDefault

void?Response(string?fruit)
{Console.WriteLine($"It's?a?{fruit}");
}Maybe<string>?apple?=?"apple";
Maybe<string>?unknownFruit?=?Maybe<string>.None;string?appleValue?=?apple.GetValueOrDefault("banana");
string?unknownFruitValue?=?unknownFruit.GetValueOrDefault("banana");Response(appleValue);?//?It's?a?apple
Response(unknownFruitValue);?//?It's?a?banana

Where

bool?IsMyFavorite(string?fruit)
{return?fruit?==?"papaya";
}Maybe<string>?apple?=?"apple";Maybe<string>?favoriteFruit?=?apple.Where(IsMyFavorite);Console.WriteLine(favoriteFruit.ToString());?//?"No?value"

Map

string?CreateMessage(string?fruit)
{return?$"The?fruit?is?a?{fruit}";
}Maybe<string>?apple?=?"apple";
Maybe<string>?noFruit?=?Maybe<string>.None;Console.WriteLine(apple.Map(CreateMessage).Unwrap("No?fruit"));?//?"The?fruit?is?a?apple"
Console.WriteLine(noFruit.Map(CreateMessage).Unwrap("No?fruit"));?//?"No?fruit"

Select

Maybe<string>?MakeAppleSauce(Maybe<string>?fruit)
{if?(fruit?==?"apple")?//?we?can?only?make?applesauce?from?apples?🍎{return?"applesauce";}return?Maybe<string>.None;
}Maybe<string>?apple?=?"apple";
Maybe<string>?banana?=?"banana";
Maybe<string>?noFruit?=?Maybe<string>.None;Console.WriteLine(apple.Bind(MakeAppleSauce).ToString());?//?"applesauce"
Console.WriteLine(banana.Bind(MakeAppleSauce).ToString());?//?"No?value"
Console.WriteLine(noFruit.Bind(MakeAppleSauce).ToString());?//?"No?value"

如對函數式編程感興趣的小伙伴，請前往Github查看官方文檔

github地址

https://github.com/vkhorikov/CSharpFunctionalExtensions

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