- private fun String.findAll(needle: String): List<Int> {
- var nextIndex = indexOf(needle)
- val positions = mutableListOf<Int>()
- while (nextIndex != -1) {
- positions += nextIndex
- nextIndex = indexOf(needle, nextIndex + 1)
- }
- return positions
- }
+ private fun String.findAll(needle: String) =
+ generateSequence(indexOf(needle).takeIf { it > -1 }) { lastPosition ->
+ lastPosition
+ .let { indexOf(needle, it + 1) }
+ .takeIf { it > -1 }
+ }.toList()