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KEEP-23 implement group and fold operations

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Docs for group-and-fold operations

Fix implementation for countEach and sumEachBy

countEach and sumEachBy implementations for JS

Rename keySelector to keyOf

Generate additional sources for groupingBy + headers

Rename countEach and sumEachBy to eachCount and eachSumOf.
This commit is contained in:
Ilya Gorbunov
2016-12-28 17:49:35 +03:00
parent 43a4035390
commit 2a2b417025
17 changed files with 492 additions and 0 deletions
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libraries/stdlib/common/src/generated/_Collections.kt
+7
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@@ -587,6 +587,13 @@ public header inline fun <T, K, M : MutableMap<in K, MutableList<T>>> Iterable<T
*/
public header inline fun <T, K, V, M : MutableMap<in K, MutableList<V>>> Iterable<T>.groupByTo(destination: M, keySelector: (T) -> K, valueTransform: (T) -> V): M
/**
* Creates a [Grouping] source from a collection to be used later with one of group-and-fold operations
* using the specified [keySelector] function to extract a key from each element.
*/
@SinceKotlin("1.1")
public header inline fun <T, K> Iterable<T>.groupingBy(crossinline keySelector: (T) -> K): Grouping<T, K>
/**
* Returns a list containing the results of applying the given [transform] function
* to each element in the original collection.