Moderne licensed

Collapse `filter { p }.<terminal>()` chains

Recipe IDorg.openrewrite.kotlin.performance.CollapseFilterTerminals$KtRecipeArtifactio.moderne.recipe:recipes-kotlin

Folds predicate-taking terminals (first, last, count, any, none, single, firstOrNull, lastOrNull, singleOrNull) and sumOf/maxOf/minOf selectors into the upstream filter or map, avoiding the intermediate list materialization.

Composite recipeProprietary

Add to your build

Get a download tokenThis recipe is Moderne licensed, so the token must belong to a Moderne customer. It replaces YOUR_DOWNLOAD_TOKEN below.

~/.gradle/gradle.properties

codeGenomeUsername=you@example.com
codeGenomeToken=YOUR_DOWNLOAD_TOKEN

build.gradle.kts

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

rewrite {
    activeRecipe("org.openrewrite.kotlin.performance.CollapseFilterTerminals$KtRecipe")
}

repositories {
    mavenCentral()
    maven {
        url = uri("https://artifacts.codegenomeproject.org/maven")
        credentials {
            username = providers.gradleProperty("codeGenomeUsername").get()
            password = providers.gradleProperty("codeGenomeToken").get()
        }
    }
}

dependencies {
    rewrite("io.moderne.recipe:recipes-kotlin:0.5.0")
}

Then run

./gradlew rewriteRun

Usage

This recipe has no required configuration options. You’ll need the Moderne CLI configured before running the command below.

mod run . --recipe org.openrewrite.kotlin.performance.CollapseFilterTerminals$KtRecipe

If the recipe isn’t available locally, install it with:

mod config recipes jar install io.moderne.recipe:recipes-kotlin:RELEASE

Definition

This recipe runs the following recipes in order.

Use first { predicate } instead of filter { predicate }.first()org.openrewrite.kotlin.performance.UseFirstWithPredicate$KtRecipe
Use last { predicate } instead of filter { predicate }.last()org.openrewrite.kotlin.performance.UseLastWithPredicate$KtRecipe
Use count { predicate } instead of filter { predicate }.count()org.openrewrite.kotlin.performance.UseCountWithPredicate$KtRecipe
Use any { predicate } instead of filter { predicate }.isNotEmpty()org.openrewrite.kotlin.performance.UseAnyWithPredicate$KtRecipe
Use none { predicate } instead of filter { predicate }.isEmpty()org.openrewrite.kotlin.performance.UseNoneWithPredicate$KtRecipe
Use firstOrNull { predicate } instead of filter { predicate }.firstOrNull()org.openrewrite.kotlin.performance.UseFirstOrNullWithPredicate$KtRecipe
Use lastOrNull { predicate } instead of filter { predicate }.lastOrNull()org.openrewrite.kotlin.performance.UseLastOrNullWithPredicate$KtRecipe
Use single { predicate } instead of filter { predicate }.single()org.openrewrite.kotlin.performance.UseSingleWithPredicate$KtRecipe
Use singleOrNull { predicate } instead of filter { predicate }.singleOrNull()org.openrewrite.kotlin.performance.UseSingleOrNullWithPredicate$KtRecipe
Use any { predicate } instead of filter { predicate }.any()org.openrewrite.kotlin.performance.UseAnyWithPredicateInsteadOfFilterAny$KtRecipe
Use none { predicate } instead of filter { predicate }.none()org.openrewrite.kotlin.performance.UseNoneWithPredicateInsteadOfFilterNone$KtRecipe
Use sumOf { selector } instead of map { selector }.sum()org.openrewrite.kotlin.performance.UseSumOfWithSelector$KtRecipe
Use maxOf { selector } instead of map { selector }.max()org.openrewrite.kotlin.performance.UseMaxOfWithSelector$KtRecipe
Use minOf { selector } instead of map { selector }.min()org.openrewrite.kotlin.performance.UseMinOfWithSelector$KtRecipe
Use mapNotNull { f } instead of map { f }.filterNotNull()org.openrewrite.kotlin.performance.UseMapNotNullForMapFilterNotNull$KtRecipe
Use firstNotNullOf { f } instead of mapNotNull { f }.first()org.openrewrite.kotlin.performance.UseFirstNotNullOfForMapFirst$KtRecipe
Use firstNotNullOfOrNull { f } instead of mapNotNull { f }.firstOrNull()org.openrewrite.kotlin.performance.UseFirstNotNullOfOrNullForMapFirstOrNull$KtRecipe

Data tables

Structured output this recipe can produce.

Source files that had resultsSource files that were modified by the recipe run.org.openrewrite.table.SourcesFileResults
Source files that had search resultsSearch results that were found during the recipe run.org.openrewrite.table.SearchResults
Source files that errored on a recipeThe details of all errors produced by a recipe run.org.openrewrite.table.SourcesFileErrors
Recipe performanceStatistics used in analyzing the performance of recipes.org.openrewrite.table.RecipeRunStats