how to remove key value from map in scala

Map(data -> "sumi", rel -> 2, privacy -> 0, status -> 1,name->"govind singh")

how to remove data from this map , if privacy is 0.

Map(rel -> 2, privacy -> 0, status -> 1,name->"govind singh")  

Solution 1:

If you use immutable maps, you can use the - method to create a new map without the given key:

val mx = Map("data" -> "sumi", "rel" -> 2, "privacy" -> 0)

val m = mx("privacy") match {
    case 0 => mx - "data"
    case _ => mx
}

=> m: scala.collection.immutable.Map[String,Any] = Map(rel -> 2, privacy -> 0)

If you use mutable maps, you can just remove a key with either -= or remove.

Solution 2:

If you're looking to scale this up and remove multiple members, then filterKeys is your best bet:

val a = Map(
  "data"    -> "sumi",
  "rel"     -> "2",
  "privacy" -> "0",
  "status"  -> "1",
  "name"    -> "govind singh"
)

val b = a.filterKeys(_ != "data")