filterIsInstance
Returns a sequence containing all elements that are instances of specified type parameter R.
inline fun <R> Sequence<*>.filterIsInstance(): Sequence<R>(source)
val mixedSequence = sequenceOf(1, "two", 3, "four", 5)
val intSequence: Sequence<Int> = mixedSequence.filterIsInstance()
val ints = intSequence.toList() // [1, 3, 5]