kotlin-stdlib/kotlin.collections/foldRightIndexed

foldRightIndexed

inline fun <T, R> Array<out T>.foldRightIndexed(initial: R, operation: (index: Int, T, acc: R) -> R): R(source)
inline fun <R> ByteArray.foldRightIndexed(initial: R, operation: (index: Int, Byte, acc: R) -> R): R(source)
inline fun <R> ShortArray.foldRightIndexed(initial: R, operation: (index: Int, Short, acc: R) -> R): R(source)
inline fun <R> IntArray.foldRightIndexed(initial: R, operation: (index: Int, Int, acc: R) -> R): R(source)
inline fun <R> LongArray.foldRightIndexed(initial: R, operation: (index: Int, Long, acc: R) -> R): R(source)
inline fun <R> FloatArray.foldRightIndexed(initial: R, operation: (index: Int, Float, acc: R) -> R): R(source)
inline fun <R> DoubleArray.foldRightIndexed(initial: R, operation: (index: Int, Double, acc: R) -> R): R(source)
inline fun <R> BooleanArray.foldRightIndexed(initial: R, operation: (index: Int, Boolean, acc: R) -> R): R(source)
inline fun <R> CharArray.foldRightIndexed(initial: R, operation: (index: Int, Char, acc: R) -> R): R(source)

Accumulates value starting with initial value and applying operation from right to left to each element with its index in the original array and current accumulator value.

Returns the specified initial value if the array is empty.

Since Kotlin

1.0

Parameters

operation

function that takes the index of an element, the element itself and current accumulator value, and calculates the next accumulator value.

inline fun <T, R> List<T>.foldRightIndexed(initial: R, operation: (index: Int, T, acc: R) -> R): R(source)

Accumulates value starting with initial value and applying operation from right to left to each element with its index in the original list and current accumulator value.

Returns the specified initial value if the list is empty.

Since Kotlin

1.0

Parameters

operation

function that takes the index of an element, the element itself and current accumulator value, and calculates the next accumulator value.

@ExperimentalUnsignedTypes
inline fun <R> UIntArray.foldRightIndexed(initial: R, operation: (index: Int, UInt, acc: R) -> R): R(source)
@ExperimentalUnsignedTypes
inline fun <R> ULongArray.foldRightIndexed(initial: R, operation: (index: Int, ULong, acc: R) -> R): R(source)
@ExperimentalUnsignedTypes
inline fun <R> UByteArray.foldRightIndexed(initial: R, operation: (index: Int, UByte, acc: R) -> R): R(source)
@ExperimentalUnsignedTypes
inline fun <R> UShortArray.foldRightIndexed(initial: R, operation: (index: Int, UShort, acc: R) -> R): R(source)

Accumulates value starting with initial value and applying operation from right to left to each element with its index in the original array and current accumulator value.

Returns the specified initial value if the array is empty.

Since Kotlin

1.3

Parameters

operation

function that takes the index of an element, the element itself and current accumulator value, and calculates the next accumulator value.