Collapse sorted().first/last() and reversed().first/last() chains

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.CollapseSortAndReverse$KtRecipe

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

mod config recipes jar install io.moderne.recipe:recipes-kotlin:0.2.0

Definition

This recipe runs the following recipes in order.

• Use min() instead of sorted().first()org.openrewrite.kotlin.performance.UseMinForSortedFirst$KtRecipe
• Use max() instead of sorted().last()org.openrewrite.kotlin.performance.UseMaxForSortedLast$KtRecipe
• Use max() instead of sortedDescending().first()org.openrewrite.kotlin.performance.UseMaxForSortedDescendingFirst$KtRecipe
• Use min() instead of sortedDescending().last()org.openrewrite.kotlin.performance.UseMinForSortedDescendingLast$KtRecipe
• Use minBy { selector } instead of sortedBy { selector }.first()org.openrewrite.kotlin.performance.UseMinByForSortedByFirst$KtRecipe
• Use maxBy { selector } instead of sortedBy { selector }.last()org.openrewrite.kotlin.performance.UseMaxByForSortedByLast$KtRecipe
• Use last() instead of reversed().first()org.openrewrite.kotlin.performance.UseLastForReversedFirst$KtRecipe
• Use first() instead of reversed().last()org.openrewrite.kotlin.performance.UseFirstForReversedLast$KtRecipe
• Use sortedByDescending { f } instead of sortedBy { f }.reversed()org.openrewrite.kotlin.performance.UseSortedByDescendingForSortedByReversed$KtRecipe
• Use sortedDescending() instead of sorted().reversed()org.openrewrite.kotlin.performance.UseSortedDescendingForSortedReversed$KtRecipe
• Use mapTo(mutableListOf(), f) instead of map(f).toMutableList()org.openrewrite.kotlin.performance.UseMapToForMapToMutableList$KtRecipe
• Use filterTo(mutableListOf(), p) instead of filter(p).toMutableList()org.openrewrite.kotlin.performance.UseFilterToForFilterToMutableList$KtRecipe
• Use filterNotTo(mutableListOf(), p) instead of filterNot(p).toMutableList()org.openrewrite.kotlin.performance.UseFilterNotToForFilterNotToMutableList$KtRecipe
• Use flatMapTo(mutableListOf(), f) instead of flatMap(f).toMutableList()org.openrewrite.kotlin.performance.UseFlatMapToForFlatMapToMutableList$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