Option

An option monad implementation in .NET. Build more resilient applications by relying on explicit code instead of compiler hints.

Getting Started

Installing

Install the NuGet package:

dotnet add package LSymds.Option

Creating options

You create options by calling the Some<T> or None<T> methods on the Option static class. This builds an Option<T> that is in a Some or None state respectively.

For example, to create a Some Option<T>:

var option = Option.Some("Hello, World!");
return option.IsSome ? option.Some : "Unknown value";

and to create a None Option<T> of the same string type:

return Option.None<string>();

Utilities

Lots of utility methods exist that hang off of an interact with the Option<T> type.

• Unwrap - Retrieves the Some value of an option or throws an InvalidOperationException if the option is None.
• UnwrapOrElse - Retrieves the Some value of an option or the provided alternative value.
• Map - Applies the provided function to the Some value of an existing option or returns the existing option if the option is None.
• OrElse - Returns the existing option if the option is Some or the provided option if it is None.