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https://github.com/shahabganji/funx
A robust and useful library to use functional programming in C#
https://github.com/shahabganji/funx
csharp functional functional-programming funx maybe-monad option railway-oriented-programming
Last synced: 2 days ago
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A robust and useful library to use functional programming in C#
- Host: GitHub
- URL: https://github.com/shahabganji/funx
- Owner: shahabganji
- Created: 2019-05-02T19:55:42.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2024-01-28T19:11:08.000Z (10 months ago)
- Last Synced: 2024-10-12T18:12:12.679Z (about 1 month ago)
- Topics: csharp, functional, functional-programming, funx, maybe-monad, option, railway-oriented-programming
- Language: C#
- Homepage:
- Size: 162 KB
- Stars: 3
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.MD
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README
## Funx
[](https://ci.appveyor.com/project/shahabganji/funx) [](https://codecov.io/gh/dotnet-toolbelt/Funx)
This is an functional library for C# developers, all the features are implemented based on what [Enrico](https://github.com/la-yumba) taught in his [Functional Programming in C#](https://www.amazon.com/Functional-Programming-write-better-code/dp/1617293954). I tried to learn them and write one for myself.
### Introduction
Funx provides robust and well-tested core basic structs for functional programming in C#, Option and Either. Option represents a possibility of lack of value.
### Installation
Easily install it via [Nuget](https://www.nuget.org/packages/Funx/).
```
Install-Package Funx
dotnet add package Funx
```
### Usage
### Option
```csharp
using Funx;
// using static Funx.Helpers; // in some scenarios it may provide better syntax && readability
var none = Option.None; // or Option none = None;
var author = Option.Some("Enrico");
var value = author.Match(() => "No Name", v => v);
WriteLine(value); // Enrico
value = none.Match(() => "No Name", v => v);
WriteLine(value); // No Name
```
I would rather to use it in a different way, since all native types can be implicitly cast to Option
```csharp
using Funx;
using static Funx.Factories;
Option none = None;
Option author = "Enrico";
var value = author.Match(() => "No Name", v => v);
WriteLine(value); // Enrico
value = none.Match(() => "No Name", v => v);
WriteLine(value); // No Name
```
Should you require more functionality and methods, import `Funx.Extensions` namespace and you'll get a bunch of handy extension method.
```csharp
using Funx;
using Funx.Extensions;
var student = new Author { Name = "Jane", Age = 17 };
var isTeenager = student.Where( s => s.Age < 20 && s.Age > 13 );
// ***** OR *********
var isTeenager = from s in student
where s.Age > 13 && s.Age < 20
select s;
```
If you want to induce side effects use `ForEach` method, the provided function will be called if a value exists:
```csharp
Option option = 11;
option.ForEach(WriteLine);
```
To map Option to another option use `Map`, and `Bind` functions, the `Map` accepts a function which returns `TR`, and `Bind` accepts a function which returns `Option`, if we pass the latter function to `Map` will end up with nested Options, like `>>`, which might not be what we expect:
```csharp
using Funx.Extensions;
using static Funx.Factories;
var str = Some("value");
string ToUpper(string v) => v.ToUpper();
var upperCase = str.Map(ToUpper); // upperCase is an Option too.
```
```csharp
using Funx;
using Funx.Extensions;
using static Funx.Factories;
var str = Some("value");
string ToUpper(string v) => v.ToUpper();
Option IsValid(string v)
{
if (v.StartsWith("v"))
return v; // all types can implicitly cast to Option, so simply return them.
return None;
}
var upperCase = str.Bind(IsValid).Map(ToUpper); // here upperCase is Option, but if we've used Map function it would be Option>
upperCase.ForEach(WriteLine);
```