Scala - filter out null values in a Array[Map[String,Int]]

Question

I have an Array of [Map[String,Int] like this:

val orArray = Array(Map("x" -> 24, "y" -> 25, "z" -> 26), null, Map("x" -> 11, "y" -> 22, "z" -> 33), null, Map("x" -> 111, "y" -> 222, "z" -> 333))

I want to remove the null elements in this array, to get something like:

Array[Map[String,Int]] = (Map("x" -> 24, "y" -> 25, "z" -> 26),  Map("x" -> 11, "y" -> 22, "z" -> 33),  Map("x" -> 111, "y" -> 222, "z" -> 333))

I was trying this so far

orArray.filterNot(p => p.isEmpty)

But it generates a NullPointerException. How could I filter out those two null values?

koiralo · Accepted Answer · 2018-04-22 13:02:56Z

4

You can simply check the null values as

orArray.filter(map  => map != null)

Output:

Map(x -> 24, y -> 25, z -> 26), Map(x -> 11, y -> 22, z -> 33), Map(x -> 111, y -> 222, z -> 333)

Hope this helps!

answered Apr 22, 2018 at 13:00

koiralo

23.2k6 gold badges57 silver badges77 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Short hand notation for filter: .filter(_ != null)