> For the complete documentation index, see [llms.txt](https://gold.gitbook.io/kotlin/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gold.gitbook.io/kotlin/collections/aggregate-operations/foldright.md).

# foldRight

fold 의 반대 오른쪽 -> 왼쪽

```kotlin
public inline fun <T,R> List<T>.foldRight(initial: R,
opertion: (T, acc: R) -> R): R {
    var accumulator = initial
    if (!isEmpty()) {
        val iterator = listIterator(size)
        while (iterator.hasPrevious()) {
            accumulator = operation(iterator.previous(), accumulator)
        }
    }    
    return accumulator
}

val list = listOf(1, 2, 3, 4, 5)

pritln(list.foldRight(0, { pre, acc -> pre + acc }))  // 15
```