Question

I often use it, and I know I can define one for myself in every project. But I want to know if there is one already defined in scala library.

Answer 1

You can use scala.xml.NodeSeq.empty, which is a completely empty block of XML rather than an empty Text node. Here’s a contrived example:

import scala.xml._

case class Person(val name: Option[String])

def renderPerson(person: Person) =
  person.name match {
    case Some(name) => <div>{ name }</div>
    case None       => NodeSeq.empty
  }

Does that help?