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https://github.com/respawn-app/ApiResult

ApiResult is a Kotlin Multiplatform declarative error handling framework that is performant, easy to use and feature-rich.
https://github.com/respawn-app/ApiResult

android arrow arrow-kt error-handling functional-programming kmm kmp kotlin monad result validation

Last synced: 5 days ago
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ApiResult is a Kotlin Multiplatform declarative error handling framework that is performant, easy to use and feature-rich.

Host: GitHub
URL: https://github.com/respawn-app/ApiResult
Owner: respawn-app
License: apache-2.0
Created: 2023-08-26T10:23:21.000Z (about 1 year ago)
Default Branch: master
Last Pushed: 2024-08-08T11:35:58.000Z (3 months ago)
Last Synced: 2024-08-09T13:36:28.262Z (3 months ago)
Topics: android, arrow, arrow-kt, error-handling, functional-programming, kmm, kmp, kotlin, monad, result, validation
Language: Kotlin
Homepage: https://opensource.respawn.pro/ApiResult
Size: 348 KB
Stars: 33
Watchers: 1
Forks: 1
Open Issues: 0
Metadata Files:
- Readme: README.md
- Contributing: docs/CONTRIBUTING.md
- License: LICENSE.txt
- Roadmap: docs/roadmap.md

Awesome Lists containing this project

awesome-kotlin-multiplatform - ApiResult - A monad for declarative & functional error-handling with a rich DSL. (Libraries / Utility)
kmp-awesome - ApiResult - Declarative Error Handling (Libraries / 🚀 Language extensions)

README

        # ApiResult

[![CI](https://github.com/respawn-app/ApiResult/actions/workflows/ci.yml/badge.svg)](https://github.com/respawn-app/ApiResult/actions/workflows/ci.yml)

![License](https://img.shields.io/github/license/respawn-app/ApiResult)

![GitHub last commit](https://img.shields.io/github/last-commit/respawn-app/ApiResult)

![Issues](https://img.shields.io/github/issues/respawn-app/ApiResult)

![GitHub top language](https://img.shields.io/github/languages/top/respawn-app/ApiResult)

[![CodeFactor](https://www.codefactor.io/repository/github/respawn-app/ApiResult/badge)](https://www.codefactor.io/repository/github/respawn-app/ApiResult)

[![AndroidWeekly #556](https://androidweekly.net/issues/issue-556/badge)](https://androidweekly.net/issues/issue-556/)

![badge][badge-android] ![badge][badge-jvm] ![badge][badge-js] ![badge][badge-nodejs] ![badge][badge-linux] ![badge][badge-windows] ![badge][badge-wasm] ![badge][badge-ios] ![badge][badge-mac] ![badge][badge-watchos] ![badge][badge-tvos]

ApiResult is a Kotlin Multiplatform declarative error handling framework that is performant, easy to use and

feature-rich.

ApiResult is [Railway Programming](https://proandroiddev.com/railway-oriented-programming-in-kotlin-f1bceed399e5) and

functional

error handling **on steroids**.

## Features

* ApiResult is **lightweight**. The library creates no objects, makes no allocations or virtual function resolutions.

  Most of the code is inlined.

* ApiResult offers 90+ operators covering most of possible use cases to turn your

  code from imperative and procedural to declarative and functional, which is more readable and extensible.

* ApiResult defines a contract that you can use in your code. No one will be able to obtain the result of a computation

  without being forced to handle errors at compilation time.

* The library has 129 tests for 92% operator coverage.

## Preview

```kotlin

// wrap a result of a computation and expose the result

class BillingRepository(private val api: RestApi) {

    suspend fun getSubscriptions() = ApiResult {

        api.getSubscriptions()

    } // -> ApiResult?>

}

// ----- 

// obtain and handle the result in the client code

val repo = BillingRepository( /* ... */)

fun onClickVerify() {

    val state: SubscriptionState = repo.getSubscriptions()

        .errorOnNull() // map nulls to error states with compile-time safety

        .recover { emptyList() } // recover from some or all errors

        .require { securityRepository.isDeviceTrusted() } // conditionally fail the chain

        .mapValues(::SubscriptionModel) // map list items

        .filter { it.isPurchased } // filter values

        .mapError { e -> BillingException(cause = e) } // map exceptions

        .then { validateSubscriptions(it) } // execute a computation and continue with its result, propagating errors

        .chain { updateGracePeriod(it) } // execute another computation, and if it fails, stop the chain

        .onError { subscriptionService.disconnect() } // executed on error

        .onEmpty { return SubscriptionState.NotSubscribed } // use non-local returns and short-circuit evaluation

        .fold(

            onSuccess = { SubscriptionState.Subscribed(it) },

            onError = { SubscriptionState.Error(it) },

        ) // unwrap the result to another value

    // ...

}

```

## Quickstart

* Documentation:

  [![Docs](https://img.shields.io/website?down_color=red&down_message=Offline&label=Docs&up_color=green&up_message=Online&url=https%3A%2F%2Fopensource.respawn.pro%2FApiResult%2F%23%2F)](https://opensource.respawn.pro/ApiResult)

* KDoc:

  [![Javadoc](https://javadoc.io/badge2/pro.respawn.apiresult/core/javadoc.svg)](https://opensource.respawn.pro/ApiResult/javadocs)

* Latest version:

  ![Maven Central](https://img.shields.io/maven-central/v/pro.respawn.apiresult/core?label=Maven%20Central)

```toml

[versions]

apiresult = "< Badge above 👆🏻 >"

[dependencies]

apiresult = { module = "pro.respawn.apiresult:core", version.ref = "apiresult" } 

```

-----

```kotlin

dependencies {

    // usually you will want to expose ApiResult types in your module APIs, so consider using api() for the dependency

    commonMainApi("pro.respawn.apiresult:core:")

}

```

Ready to try? Start with reading the [Quickstart Guide](https://opensource.respawn.pro/ApiResult/#/quickstart).

## License

```

   Copyright 2022-2024 Respawn Team and contributors

   Licensed under the Apache License, Version 2.0 (the "License");

   you may not use this file except in compliance with the License.

   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software

   distributed under the License is distributed on an "AS IS" BASIS,

   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

   See the License for the specific language governing permissions and

   limitations under the License.

```

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