Apply Kotlin performance idioms
Recipe ID
org.openrewrite.kotlin.performance.Performance$KtRecipeArtifact
io.moderne.recipe:recipes-kotlinOpinionated bundle of every performance recipe in this module: chain collapses (filter/map/sort/reverse), Compose primitive-state holders, and hot-path allocation finders. Search-result recipes coexist with rewriting recipes — for diff-only output, use ImproveKotlinPerformance instead.
Usage
This recipe has no required configuration options. You’ll need the Moderne CLI configured before running the command below.
mod run . --recipe org.openrewrite.kotlin.performance.Performance$KtRecipeIf the recipe isn’t available locally, install it with:
mod config recipes jar install io.moderne.recipe:recipes-kotlin:0.2.0Definition
This recipe runs the following recipes in order.
- Collapse
filter { p }.<terminal>()chainsorg.openrewrite.kotlin.performance.CollapseFilterTerminals$KtRecipe - Collapse
sorted().first/last()andreversed().first/last()chainsorg.openrewrite.kotlin.performance.CollapseSortAndReverse$KtRecipe - Use primitive
mutable<Int|Long|Float|Double>StateOfin Composeorg.openrewrite.kotlin.performance.UseComposePrimitiveStateOf$KtRecipe - Use
sb.lengthinstead ofsb.toString().lengthorg.openrewrite.kotlin.performance.UseLengthForStringBuilderSize$KtRecipe - Find expensive allocations on hot paths
org.openrewrite.kotlin.performance.FindAllocationsInHotPaths$KtRecipe - Find expensive allocations inside collection lambdas
org.openrewrite.kotlin.performance.FindAllocationsInCollectionLambdas$KtRecipe - Find
Sequence/Listpipeline shape smellsorg.openrewrite.kotlin.performance.FindSequencePipelineSmells$KtRecipe - Find string-allocation smells
org.openrewrite.kotlin.performance.FindStringConcatSmells$KtRecipe - Find collection construction inside loops
org.openrewrite.kotlin.performance.FindLoopAllocations$KtRecipe - Find iteration-shape smells
org.openrewrite.kotlin.performance.FindIterationSmells$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