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Typecheck when mapping some items in a sequence to None

Use collect instead of map to keep only the elements you want:

val elements = parent.child.collect {
    case n if (n.label == "p") => Paragraph(n)
    case n if (n.label.matches("hd")) =>
Heading(n, n.child.head))

Anything that isn't defined within the PartialFunction you pass to collect is discarded.

There's no reason to map to None if you're just going to discard the elements anyway. And if you do for some reason want to keep the None instances, then the others should be mapped to Some[Element] so that you'd have Seq[Option[Element].

Categories : Scala

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