Why does this compile?
def foo() : Iterable[URI] = {
Some("")
.map(URI.create)
}
Scala Option[String] map turns in Iterable
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1 Answers
There is an implicit conversion called option2Iterable defined directly on Option, it converts all Option[A] into an Iterable[A] with zero or one element.
A much shorter code snippet that demonstrates this somewhat unexpected behavior is the following:
(Option(42): Iterable[Int])
It will quietly convert Option into a List, in this case producing a List(42).
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