LINQ analogues in Scala?

Question

Are there any sane analogues to LINQ (.NET) exists for Scala?

Answer 1

There are many situations in Scala where you can use monadic constructs as a sort of query language.

For example, to query XML (in this case, extracting URLs from links in some XHTML):

def findURLs(xml: NodeSeq): Seq[URL] = 
  for {
    a <- xml \\ "a"
    href <- a attribute "href"
    url <- href.text
  } yield URL(url)

For an analogue of LINQ to SQL, the closest thing is probably ScalaQuery. To lift an example right out of the docs:

val q4c = for {
  u <- Users
  o <- Orders if o.userID is u.id
} yield u.first ~ o.orderID