kotlin-stdlib/kotlin.sequences/flatMapTo

flatMapTo

@JvmName(name = "flatMapIterableTo")
inline fun <T, R, C : MutableCollection<in R>> Sequence<T>.flatMapTo(destination: C, transform: (T) -> Iterable<R>): C
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Appends all elements yielded from results of transform function being invoked on each element of original sequence, to the given destination.

The operation is terminal.

Since Kotlin

1.4
inline fun <T, R, C : MutableCollection<in R>> Sequence<T>.flatMapTo(destination: C, transform: (T) -> Sequence<R>): C
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Appends all elements yielded from results of transform function being invoked on each element of original sequence, to the given destination.

The operation is terminal.