LanguageExt.Extras

A collection of extension methods and helpers which extend the use of LanguageExt.

This project is not affiliated with LanguageExt and asserts no claims upon its intellectual property.

Installation

Install LanguageExt.Extras as a NuGet package, via an IDE package manager, or using the command-line instructions at nuget.org.

Use / API

Using Statements

LanguageExt.Extras extends existing LanguageExt types. As such, you'll need both LanguageExt and LanguageExt.Extras in scope.

All API examples shown below assume the following using statements:

using LanguageExt;
using LanguageExt.Common;
using Jds.LanguageExt.Extras;

Either<TLeft, TRight> Extensions

• Either<TLeft, TRight>.BindLeftAsync<TLeft, TRight, TLeft2>(Func<TLeft, Task<Either<TLeft2, TRight>>> func)
  • Executes func, which returns a Task<Either<TLeft2, TRight>>, when the either is a TLeft.
• Either<TLeft, TRight>.Filter<TLeft, TRight>(Func<TRight, bool> filter, Func<TRight, TLeft> onFalse)
  • Filters right values by executing filter. If it returns true, the existing value is returned. If it returns false, then it executes onFalse to create a TLeft.
• Either<TLeft, TRight>.FilterAsync<TLeft, TRight>(Func<TRight, Task<bool>> filter, Func<TRight, TLeft> onFalse)
  • Filters right values by executing filter. If it returns true, the existing value is returned. If it returns false, then it executes onFalse to create a TLeft.
• Either<TLeft, TRight>.FilterAsync<TLeft, TRight>(Func<TRight, Task<bool>> filter, Func<TRight, Task<TLeft>> onFalse)
  • Filters right values by executing filter. If it returns true, the existing value is returned. If it returns false, then it executes onFalse to create a TLeft.
• Either<TLeft, TRight>.MapLeftAsync<TLeft, TRight, TLeft2>(Func<TLeft, Task<TLeft2>> func)
  • Executes func, which returns a Task<TLeft2>, when the either is a TLeft.
• Either<TLeft, TRight>.Tap<TLeft, TRight>(Action<TRight> onRight, Action<TLeft> onLeft)
  • Executes a side effect, e.g., logging, based upon the state of the either. The current value is returned unchanged.
• Either<TLeft, TRight>.TapAsync<TLeft, TRight>(Func<TRight, Task> onSuccess, Func<TLeft, Task> onFailure)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, based upon the state of the either. The current value is returned unchanged.
• Either<TLeft, TRight>.TapLeft<TLeft, TRight>(Action<TLeft> onFailure)
  • Executes a side effect, e.g., logging, when the either is a left. The current value is returned unchanged.
• Either<TLeft, TRight>.TapLeftAsync<TLeft, TRight>(Func<TLeft, Task> onFailure)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, when the either is a left. The current value is returned unchanged.
• Either<TLeft, TRight>.TapRight<TLeft, TRight>(Action<TRight> onSuccess)
  • Executes a side effect, e.g., logging, when the either is a right. The current value is returned unchanged.
• Either<TLeft, TRight>.TapRightAsync<TLeft, TRight>(Func<TRight, Task> onSuccess)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, when the either is a right. The current value is returned unchanged.
• Either<TLeft, TRight>.ToResult<TLeft, TRight>(Func<TLeft, Exception> ifLeft)
  • Converts the Either<TLeft, TRight> into a Result<TRight>.
• Either<TLeft, TRight>.ToResult<TLeft, TRight>() where TLeft : Exception
  • Converts the Either<TLeft, TRight> into a Result<TRight>.

Option<TSome> Extensions

• Option<TSome>.Tap(Action<TSome> ifSome, Action ifNone)
  • Executes a side effect, e.g., logging, based upon the state of the option. The current value is returned unchanged.
• Option<TSome>.TapAsync(Func<TSome,Task> ifSome, Func<Task> ifNone)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, based upon the state of the option. The current value is returned unchanged.
• Option<TSome>.TapNone(Action ifNone)
  • Executes a side effect, e.g., logging, if the option is None. The current value is returned unchanged.
• Option<TSome>.TapNoneAsync(Func<Task> ifNone)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, if the option is None. The current value is returned unchanged.
• Option<TSome>.TapSome(Action<TSome> ifSome)
  • Executes a side effect, e.g., logging, if the option is Some. The current value is returned unchanged.
• Option<TSome>.TapSomeAsync(Func<TSome,Task> ifSome)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, if the option is Some. The current value is returned unchanged.
• Option<TSome?>.ToNonNullable()
  • Converts the nullable TSome generic argument to a non-nullable TSome generic argument, e.g., Option<string?> returns Option<string>. The existing value is maintained unchanged.
  • This method assumes execution within a #nullable context (i.e., in a project where nullable reference types are enabled).

Result<TSuccess> Extensions

• Result<TSuccess>.Bind<TSuccess, TNewSuccess>(Func<TSuccess, Result<TNewSuccess>> func)
  • Executes func, which returns Result<TNewSuccess>, when the result is a success.
• Result<TSuccess>.BindAsync<TSuccess, TNewSuccess>(Func<TSuccess, Task<Result<TNewSuccess>>> func)
  • Executes func, which returns Task<Result<TNewSuccess>>, when the result is a success.
• Result<TSuccess>.BindFailure<TSuccess>(Func<Exception, Result<TSuccess>> func)
  • Executes func, which returns Result<TSuccess>, when the result is a failure.
• Result<TSuccess>.BindFailureAsync<TSuccess>(Func<Exception, Task<Result<TSuccess>>> func)
  • Executes func, which returns Task<Result<TSuccess>>, when the result is a failure.
• Result<TSuccess>.Filter<TSuccess>(Func<TSuccess, bool> filter, Func<TSuccess, Exception> onFalse)
  • Filters TSuccess values by executing filter. If it returns true, the existing value is returned. If it returns false, then it executes onFalse to create an Exception.
• Result<TSuccess>.FilterAsync<TSuccess>(Func<TSuccess, Task<bool>> filter, Func<TSuccess, Exception> onFalse)
  • Filters TSuccess values by executing filter. If it returns true, the existing value is returned. If it returns false, then it executes onFalse to create an Exception.
• Result<TSuccess>.FilterAsync<TSuccess>(Func<TSuccess, Task<bool>> filter, Func<TSuccess, Task<Exception>> onFalse)
  • Filters TSuccess values by executing filter. If it returns true, the existing value is returned. If it returns false, then it executes onFalse to create an Exception.
• Result<TSucess>.IfFailThrow<TSuccess>()
  • Throws an InvalidOperationException if the Result<TSucess> is an Exception, returning TSuccess upon success.
• Result<TSuccess>.MapFailure<TSuccess, TFailure>(Func<Exception, TFailure> func) where TFailure : Exception
  • Executes func, which returns an Exception, when the result is a failure.
• Result<TSuccess>.MapFailureAsync<TSuccess, TFailure>(Func<Exception, Task<TFailure>> func) where TFailure : Exception
  • Executes func, which returns a Task<Exception>, when the result is a failure.
• Result<TSuccess>.MapSafe<TSuccess, TNewSuccess>(Func<TSuccess, TNewSuccess> func)
  • Executes func, which returns TNewSuccess, when the result is a success. Exceptions are caught and returned as a failure. (I.e., this simplifies result.Bind(value => Prelude.Try(() => func(value)).Try()))
• Result<TSuccess>.MapSafeAsync<TSuccess, TNewSuccess>(Func<TSuccess, Task<TNewSuccess>> func)
  • Executes func, which returns Task<TNewSuccess>, when the result is a success. Exceptions are caught and returned as a failure. (I.e., this simplifies result.BindAsync(value => Prelude.TryAsync(() => func(value)).Try()))
• Result<TSuccess>.Tap<TSuccess>(Action<TSuccess> onSuccess, Action<Exception> onFailure)
  • Executes a side effect, e.g., logging, based upon the state of the result. The current value is returned unchanged.
• Result<TSuccess>.TapAsync<TSuccess>(Func<TSuccess, Task> onSuccess, Func<Exception, Task> onFailure)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, based upon the state of the result. The current value is returned unchanged.
• Result<TSuccess>.TapFailure<TSuccess>(Action<Exception> onFailure)
  • Executes a side effect, e.g., logging, when the result is a failure. The current value is returned unchanged.
• Result<TSuccess>.TapFailureAsync<TSuccess>(Func<Exception, Task> onFailure)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, when the result is a failure. The current value is returned unchanged.
• Result<TSuccess>.TapSuccess<TSuccess>(Action<TSuccess> onSuccess)
  • Executes a side effect, e.g., logging, when the result is a success. The current value is returned unchanged.
• Result<TSuccess>.TapSuccessAsync<TSuccess>(Func<TSuccess, Task> onSuccess)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, when the result is a success. The current value is returned unchanged.
• Result<TSuccess>.ToEither<TSuccess>()
  • Converts the Result<TSuccess> into an Either<Exception, TSuccess>.

Try<TSuccess> Extensions

• Try<TSuccess>.Filter<TSuccess>(Func<TSuccess, bool> filter, Func<TSuccess, Exception> onFalse)
  • Filters TSuccess results by executing filter. If it returns true, the existing value is returned. If it returns false, then it executes onFalse to create an Exception. Memoizes successful results.
• Try<TSuccess>.Tap<TSuccess>(Action<TSuccess> onSuccess, Action<Exception> onFailure)
  • Executes a side effect, e.g., logging, based upon the state of the result. The current value is returned unchanged.
• Try<TSuccess>.TapFailure<TSuccess>(Action<Exception> onFailure)
  • Executes a side effect, e.g., logging, when the result is a failure. The current value is returned unchanged.
• Try<TSuccess>.TapSuccess<TSuccess>(Action<TSuccess> onSuccess)
  • Executes a side effect, e.g., logging, when the result is a success. The current value is returned unchanged.

TryAsync<TSuccess> Extensions

• TryAsync<TSuccess>.Filter<TSuccess>(Func<TSuccess, bool> filter, Func<TSuccess, Exception> onFalse)
  • Filters TSuccess results by executing filter. If it returns true, the existing value is returned. If it returns false, then it executes onFalse to create an Exception. Memoizes successful results.
• TryAsync<TSuccess>.FilterAsync<TSuccess>(Func<TSuccess, Task<bool>> filter, Func<TSuccess, Exception> onFalse)
  • Filters TSuccess results by executing filter. If it returns true, the existing value is returned. If it returns false, then it executes onFalse to create an Exception. Memoizes successful results.
• TryAsync<TSuccess>.Filter<TSuccess>(Func<TSuccess, Exception> ifCanceled, CancellationToken cancellationToken)
  • Filters based upon cancellationToken. If it is not cancelled, the existing value is returned. If it is cancelled, then it executes ifCanceled to create an Exception.
• TryAsync<TSuccess>.Filter<TSuccess>(CancellationToken cancellationToken)
  • Filters based upon cancellationToken. If it is not cancelled, the existing value is returned. If it is cancelled, then it creates an OperationCanceledException with cancellationToken.
• TryAsync<TSuccess>.Tap<TSuccess>(Action<TSuccess> onSuccess, Action<Exception> onFailure)
  • Executes a side effect, e.g., logging, based upon the state of the result. The current value is returned unchanged.
• TryAsync<TSuccess>.Tap<TSuccess>(Func<TSuccess, Task> onSuccess, Func<Exception, Task> onFailure)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, based upon the state of the result. The current value is returned unchanged.
• TryAsync<TSuccess>.TapFailure<TSuccess>(Action<Exception> onFailure)
  • Executes a side effect, e.g., logging, when the result is a failure. The current value is returned unchanged.
• TryAsync<TSuccess>.TapFailure<TSuccess>(Func<Exception, Task> onFailure)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, when the result is a failure. The current value is returned unchanged.
• TryAsync<TSuccess>.TapSuccess<TSuccess>(Action<TSuccess> onSuccess)
  • Executes a side effect, e.g., logging, when the result is a success. The current value is returned unchanged.
• TryAsync<TSuccess>.TapSuccess<TSuccess>(Func<TSuccess, Task> onSuccess)
  • Executes an asynchronous side effect, e.g., dispatching a status notification via HttpClient, when the result is a success. The current value is returned unchanged.

HttpClient / Web API Helpers

HttpClient Extensions

• HttpClient.TryDeleteAsync(Uri? uri, CancellationToken cancellationToken = default)
  • Tries to asynchronously execute .DeleteAsync(), returning a TryAsync<HttpResponseMessage>.
• HttpClient.TryGetAsync(Uri? uri, HttpCompletionOption completionOption, CancellationToken cancellationToken = default)
• HttpClient.TryGetAsync(Uri? uri, CancellationToken cancellationToken = default)
  • Tries to asynchronously execute .GetAsync(), returning a TryAsync<HttpResponseMessage>.
• HttpClient.TryGetForJsonAsync(Uri? uri, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
  • Tries to asynchronously execute .GetAsync() and deserialize the response body as JSON, returning a TryAsync<DeserializedHttpResponseMessage<T>>.
• HttpClient.TryPostAsync(Uri? uri, HttpContent? content, CancellationToken cancellationToken = default)
  • Tries to asynchronously execute .PostAsync(), returning a TryAsync<HttpResponseMessage>.
• HttpClient.TryPostForJsonAsync(Uri? uri, HttpContent? content, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
  • Tries to asynchronously execute .PostAsync() and deserialize the response body as JSON, returning a TryAsync<DeserializedHttpResponseMessage<T>>.
• HttpClient.TryPutAsync(Uri? uri, HttpContent? content, CancellationToken cancellationToken = default)
  • Tries to asynchronously execute .PutAsync(), returning a TryAsync<HttpResponseMessage>.
• HttpClient.TryPutForJsonAsync<T>(Uri? uri, HttpContent? content, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
  • Tries to asynchronously execute .PutAsync() and deserialize the response body as JSON, returning a TryAsync<DeserializedHttpResponseMessage<T>>.
• HttpClient.TrySendAsync(HttpRequestMessage requestMessage, HttpCompletionOption completionOption, CancellationToken cancellationToken = default)
• HttpClient.TrySendAsync(HttpRequestMessage requestMessage, CancellationToken cancellationToken = default)
  • Tries to asynchronously execute .SendAsync(), returning a TryAsync<HttpResponseMessage>.
• HttpClient.TrySendForJsonAsync<T>(HttpRequestMessage requestMessage, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
  • Tries to asynchronously execute .SendAsync() and deserialize the response body as JSON, returning a TryAsync<DeserializedHttpResponseMessage<T>>.

HttpContent Extensions

• HttpContent.TryReadAsStringAsync(CancellationToken cancellationToken = default)
  • Tries to asynchronously read the HttpContent as a string, returning a TryAsync<string>

HttpResponseMessage Extensions

• HttpResponseMessage.TryReadContentAsStringAsync(CancellationToken cancellationToken = default)
  • Tries to asynchronously read the message's .Content as a string, returning a TryAsync<string>.
• HttpResponseMessage.TryDeserializeContentAsJsonAsync<T>(JsonSerializerOptions? options = null, CancellationToken cancellationToken = default) where T : notnull
  • Tries to asynchronously read the message's .Content as a JSON string and deserialize it as T, returning a TryAsync<T>.
• HttpResponseMessage.TryReadContentAsJsonAsync<T>(JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) where T : notnull
  • Tries to asynchronously read the message's .Content as a JSON string and deserialize it as T, returning all components, TryAsync<(HttpResponseMessage Message, Result<string> Content, Result<T> Body)>.
  • This method is extremely useful in ASP.NET integration tests. It succinctly parses API responses and maintains full access to the HttpResponseMessage and any Exceptions, supporting thorough testing of success and failure paths.