Scala filter on two conditions

Using slightly less concise lambda syntax:

mystuff = mystuff.filter(x => (x.isX && x.name == "xyz"))

You can find more detail on Scala anonymous function syntax here.

arrays scala filter multiple-conditions

While there might be some performance impact depending on what "myStuff" is, you could always filter twice

mystuff = mystuff.filter(_.isX).filter(_.name == "xyz")

arrays scala filter multiple-conditions

If you need to frequently filter with several predicate, you could define a way of combining them:

case class And[A]( p1: A=>Boolean, p2: A=>Boolean ) extends (A=>Boolean) {  def apply( a: A ) = p1(a) && p2(a)}

Here is how to use it to keep only the odd numbers bigger than 10:

scala> (0 until 20) filter And( _ > 10, _ % 2 == 1 )res3: scala.collection.immutable.IndexedSeq[Int] = Vector(11, 13, 15, 17, 19)

It easy to write Or and Not combinators in the same fashion.

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