PG.FunctionalExt

FunctionalExt

Functional programming types Result and Option

Option Type

The Option type represents a value that may or may not exist. It is useful for modeling optional values without resorting to null references. The Option type has two possible states:

• Some(value): Represents an existing value.
• None: Represents the absence of a value.

Example Usage

Option<int> maybeNumber = Some(42);
Option<int> noNumber = None<int>();

maybeNumber.Match(
    some: value => Console.WriteLine($"Value: {value}"),
    none: () => Console.WriteLine("No value")
);

Result Type

The Result type represents the outcome of an operation that can either succeed or fail. It is useful for error handling without using exceptions. The Result type has two possible states:

• Success(value): Represents a successful result with a value.
• Fail(error): Represents a failure with an error.

Example Usage

Result<int, GenericError> divide(int numerator, int denominator)
{
    if (denominator == 0)
        return Fail<int, GenericError>(new GenericError("Division by zero"));
    return Success<int, GenericError>(numerator / denominator);
}

var result = divide(10, 2);
result.Match(
    success: value => Console.WriteLine($"Result: {value}"),
    error: err => Console.WriteLine($"Error: {err}")
);

Installation

To use this library, add it to your project via NuGet:

dotnet add package FunctionalExt

License

This project is licensed under the MIT License. See the LICENSE file for details.