it shouldn't be used as a lambda parameter name

org.openrewrite.kotlin.cleanup.ImplicitParameterInLambda

it is a special identifier that allows you to refer to the current parameter being passed to a lambda expression without explicitly naming the parameter. Lambda expressions are a concise way of writing anonymous functions. Many lambda expressions have only one parameter, when this is true the compiler can determine the parameter type by context. Thus when using it with single parameter lambda expressions, you do not need to declare the type.

Tags

• RSPEC-S6558

Recipe source

GitHub, Issue Tracker, Maven Central

• groupId: org.openrewrite

• artifactId: rewrite-kotlin

• version: 1.14.0

Usage

This recipe has no required configuration options. It can be activated by adding a dependency on org.openrewrite:rewrite-kotlin:1.14.0 in your build file or by running a shell command (in which case no build changes are needed):

Gradle

1. Add the following to your build.gradle file:

build.gradle

plugins {
    id("org.openrewrite.rewrite") version("6.12.0")
}

rewrite {
    activeRecipe("org.openrewrite.kotlin.cleanup.ImplicitParameterInLambda")
}

repositories {
    mavenCentral()
}

dependencies {
    rewrite("org.openrewrite:rewrite-kotlin:1.14.0")
}

2. Run gradle rewriteRun to run the recipe.

Gradle init script

1. Create a file named init.gradle in the root of your project.

init.gradle

initscript {
    repositories {
        maven { url "https://plugins.gradle.org/m2" }
    }
    dependencies { classpath("org.openrewrite:plugin:6.12.0") }
}
rootProject {
    plugins.apply(org.openrewrite.gradle.RewritePlugin)
    dependencies {
        rewrite("org.openrewrite:rewrite-kotlin:1.14.0")
    }
    rewrite {
        activeRecipe("org.openrewrite.kotlin.cleanup.ImplicitParameterInLambda")
    }
    afterEvaluate {
        if (repositories.isEmpty()) {
            repositories {
                mavenCentral()
            }
        }
    }
}

2. Run gradle --init-script init.gradle rewriteRun to run the recipe.

Maven POM

1. Add the following to your pom.xml file:

pom.xml

<project>
  <build>
    <plugins>
      <plugin>
        <groupId>org.openrewrite.maven</groupId>
        <artifactId>rewrite-maven-plugin</artifactId>
        <version>5.29.0</version>
        <configuration>
          <activeRecipes>
            <recipe>org.openrewrite.kotlin.cleanup.ImplicitParameterInLambda</recipe>
          </activeRecipes>
        </configuration>
        <dependencies>
          <dependency>
            <groupId>org.openrewrite</groupId>
            <artifactId>rewrite-kotlin</artifactId>
            <version>1.14.0</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>

2. Run mvn rewrite:run to run the recipe.

Maven Command Line

shell

mvn -U org.openrewrite.maven:rewrite-maven-plugin:run -Drewrite.recipeArtifactCoordinates=org.openrewrite:rewrite-kotlin:RELEASE -Drewrite.activeRecipes=org.openrewrite.kotlin.cleanup.ImplicitParameterInLambda

Moderne CLI

You will need to have configured the Moderne CLI on your machine before you can run the following command.

shell

mod run . --recipe ImplicitParameterInLambda

See how this recipe works across multiple open-source repositories

The community edition of the Moderne platform enables you to easily run recipes across thousands of open-source repositories.

Please contact Moderne for more information about safely running the recipes on your own codebase in a private SaaS.

Contributors

Kun Li, Tracey Yoshima, Knut Wannheden, Tim te Beek