flatMap or flatten

[Igor Baklan]

+1

Good step toward (`JS` <= [`Scala`](
https://www.scala-lang.org/documentation/) ) unification. ( [flatMap](
https://www.scala-lang.org/api/current/scala/collection/TraversableLike.html#flatMap[B](f:A=>scala.collection.GenTraversableOnce[B]):Traversable[B])
, [flatten](
https://www.scala-lang.org/api/current/scala/collection/generic/GenericTraversableTemplate.html#flatten[B]:Traversable[B])
)
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