VisualBasicFunctionalExtensions 0.0.5

VisualBasicFunctionalExtensions

Package ID: VisualBasicFunctionalExtensions
Version: 0.0.5 Owner: Justi
License: MIT

Overview

VisualBasicFunctionalExtensions is a functional library for Visual Basic .NET 2.0, drawing inspiration from Rust's functional programming concepts. The library is designed without a focus on performance, making it suitable for various applications.

Installation

Install via NuGet Package Manager Console:

dotnet add package VisualBasicFunctionalExtensions --version 0.0.5

Features

• Result and Maybe Monads

Examples

Introduction to all the methods and function the library has to offer.

Result

Try

Try(Of T, E)(func As Func(Of T), onError As Func(Of Exception, E)) As Result(Of T, E)

    Private Const expectedMessage = "Can not sqrt negative integers"

    Public Function CustomSqrt(x As Integer) As Double
        If x < 0 Then
            Throw New Exception(expectedMessage)
        Else
            Return Math.Sqrt(x)
        End If
    End Function

    Public Sub ExampleNoException()
        Dim value = 15
        Dim expected = Result(Of Double, String).Ok(CustomSqrt(value))
        Dim res = Result(Of Double, String).
            Try(
                Function() CustomSqrt(value),
                Function(exception) exception.Message
            )

        Assert.AreEqual(expected, res)
    End Sub

    Public Sub ExampleCatchException()
        Dim value = -1
        Dim expected  = Result(Of Double, String).Err(errorValue:=expectedMessage)
        Dim res = Result(Of Double, String).
            Try(
                Function() CustomSqrt(value),
                Function(exception) exception.Message
            )

        Assert.AreEqual(expected, res)
    End Sub

Authors

Justin Kasteleijn Nadia Alrayes

License

MIT License

Copyright

(c) Justin Kasteleijn 2024

Bug Reporting

For bug reports, visit the GitHub repository.