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sam/for-blahbrehensions.scala

Last active August 26, 2016 22:04
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A trivial, common example and for-comprehensions failing at it.
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for-blahbrehensions.scala
// fold
client ! Projects(rows.headOption.fold(Nil)(_ \ "value" extract))
// map.getOrElse
client ! Projects(rows.headOption
.map(_ \ "value" extract)
.getOrElse(Nil))
// Option.toList
client ! Projects(rows.headOption.toList.map(_ \ "value" extract))
// for-comprehension
client ! Projects(for { head <- rows.headOption.toList } yield head \ "value" extract)
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