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Introduce filterIndexed

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#KT-9502 Fixed
This commit is contained in:
Ilya Gorbunov
2015-11-07 17:55:33 +03:00
parent ee759c10c8
commit 008a8059cf
9 changed files with 310 additions and 27 deletions
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libraries/stdlib/src/generated/_Collections.kt
+19 -2
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@@ -668,12 +668,29 @@ public inline fun <T> Iterable<T>.dropWhile(predicate: (T) -> Boolean): List<T>
}
/**
* Returns a list containing all elements matching the given [predicate].
* Returns a list containing only elements matching the given [predicate].
*/
public inline fun <T> Iterable<T>.filter(predicate: (T) -> Boolean): List<T> {
return filterTo(ArrayList<T>(), predicate)
}
/**
* Returns a list containing only elements matching the given [predicate].
*/
public inline fun <T> Iterable<T>.filterIndexed(predicate: (Int, T) -> Boolean): List<T> {
return filterIndexedTo(ArrayList<T>(), predicate)
}
/**
* Appends all elements matching the given [predicate] to the given [destination].
*/
public inline fun <T, C : MutableCollection<in T>> Iterable<T>.filterIndexedTo(destination: C, predicate: (Int, T) -> Boolean): C {
forEachIndexed { index, element ->
if (predicate(index, element)) destination.add(element)
}
return destination
}
/**
* Returns a list containing all elements not matching the given [predicate].
*/
@@ -705,7 +722,7 @@ public inline fun <T, C : MutableCollection<in T>> Iterable<T>.filterNotTo(desti
}
/**
* Appends all elements matching the given [predicate] into the given [destination].
* Appends all elements matching the given [predicate] to the given [destination].
*/
public inline fun <T, C : MutableCollection<in T>> Iterable<T>.filterTo(destination: C, predicate: (T) -> Boolean): C {
for (element in this) if (predicate(element)) destination.add(element)