NullAway
ktlint
NullAway | ktlint | |
---|---|---|
21 | 7 | |
3,530 | 6,009 | |
1.0% | 0.4% | |
8.9 | 9.5 | |
3 days ago | 2 days ago | |
Java | Kotlin | |
MIT License | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
NullAway
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What if null was an Object in Java?
Fortunately, Uber made tooling for languages with broken type systems
* https://github.com/uber/NullAway
* https://github.com/uber-go/nilaway
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My Thoughts on “Bad Code”
Some patterns arise from language design
* You can't express `T` where `null` is forbidden in the type system so you get NullPointerException everywhere and defensive null checks.
* You express a sum type as a product type because your language does not have sum types .
* Your language doesn't have first class multiple return values (or tuples) so you return extra parameters via out parameters or thread local variables such as `errno`.
* Your language doesn't have exceptions (or algebraic effects) and can't do IO so you have monad transformers.
* Your language doesn't have set-theoretic types so you need hacks like `thiserror` .
* Your language doesn't have stackful coroutines or can't infer async IO for you so you have `async/await` spam or callback hell or "mono's".
* Your language doesn't have exhaustive checks (or pattern matching) so you need a fallthrough case check on switch statements .
* Your language doesn't have algebraic effects, so you need to pass context everywhere.
I know someone will reply about Java's null annotation checking options, so here is one of them: https://github.com/uber/NullAway .
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Will Project Valhalla bring Kotlin-like nulls to Java?
If you must use Java, use Uber's Nullaway which gives null safety via Errorprone.
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Retrofitting null-safety onto Java at Meta
Does anyone have experience using this at Meta who can compare to https://github.com/uber/NullAway ?
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How to use Java Records
A special kind of validation is enforcing that record fields are not null. (Un)fortunately, records do not have any special behavior regarding nullability. You can use tools like NullAway or Error Prone to prevent null in your code in general, or you can add checks to your records:
- Backend Java 19 vs Kotlin?
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What does the future hold for Project Amber?
What do you think of https://github.com/uber/NullAway
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Plans for Compile-time Null Pointer Safety?
Take a look at NullAway, a plugin for Error Prone.
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Ask HN: What is a modern Java environment?
PMD, Spotbugs, Nullaway: Java linting/static analysis (https://pmd.github.io, https://spotbugs.github.io, https://github.com/uber/NullAway)
- Nullaway fully supports switch expressions without issues now in 0.9.5
ktlint
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Setting up linting/formatting for an Android project
In my experience, I have faced these issues while trying to keep the code style consistent across the team - 1. ktlint and "Reformat Code" in Android Studio produce different outputs. This causes issues as most developers find it easier to use "Reformat Code" in AS but if you have a ktlint check on CI, the checks sometimes fail. 2. Different AS versions produce different `codeStyles.xml` file. Sometimes, on updating AS, it automatically adds new rules to the `codeStyles.xml` file. These rules might not be compatible with ktlint and might only work on specific AS versions.
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Modern Android Development in 2023
Ktlint
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Three features in Android Studio that maybe you've missed
Not even an Android Studio-specific feature, but rather a feature of the underlying IntelliJ. Just select Code > Analyze code > Silent code cleanup and your entire project will be cleaned up using the default linter (this can be combined awesomely with Ktlint).
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Ask HN: What is a modern Java environment?
Ktlint + Detekt: Kotlin linting/static analysis (https://ktlint.github.io, https://detekt.github.io/detekt)
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Adding Klint to my Android apps
Refs. Klint Page Klint Github
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Supercharge your Kotlin Project
Linting is the process of analyzing code for potential errors and one of the ways we can do that in Kotlin is using Ktlint. As per the documentation:
What are some alternatives?
SonarQube - Continuous Inspection
detekt - Static code analysis for Kotlin
Error Prone - Catch common Java mistakes as compile-time errors
sonarlint-intellij - SonarLint for IntelliJ
infer - A static analyzer for Java, C, C++, and Objective-C
ktfmt-gradle - A Gradle plugin to apply ktfmt to your builds, and reformat you Kotlin source code like a glimpse 🧹🐘
Spotbugs - SpotBugs is FindBugs' successor. A tool for static analysis to look for bugs in Java code.
dokka - API documentation engine for Kotlin
FindBugs - The new home of the FindBugs project
ktlint-gradle - A ktlint gradle plugin
Checkstyle - Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.
CrunchyCalendar — awesome calendar widget for android apps - A beautiful material calendar with endless scroll, range selection and a lot more!