The deletion of Scala map keys can be obtained by utilizing – operator. This operator is utilized to delete the set of keys of the map.
Syntax:
def -(elem1: A, elem2: A, elems: A*): Map[A, B]
It returns a new map containing all the elements of the given Map except the set of keys which are deleted using the above operator.
Example #1:
// Scala program of deleting // keys // Creating object object GfG
{ // Main method
def main(args : Array[String])
{
// Creating a map
val m 1 = Map( "geeks" - > 5 , "for" - > 3 )
// Applying - operator
val result = m 1 .-( "for" )
// Displays output
println(result)
}
} |
Output:
Map(geeks -> 5)
In above example here for key is deleted.
Example #2:
// Scala program of deleting // keys // Creating object object GfG
{ // Main method
def main(args : Array[String])
{
// Creating a map
val m 1 = Map( "geeks" - > 5 , "for" - > 3 , "cs" - > 2 )
// Applying - operator
val result = m 1 .-( "for" , "geeks" )
// Displays output
println(result)
}
} |
Output:
Map(cs -> 2)