The ::() operator in Scala is utilized to add an element to the beginning of the List.
Method Definition: def ::(x: A): List[A]
Return Type: It returns the stated list after adding an element to the beginning of it.
Example #1:
// Scala program of ::() // method // Creating object object GfG
{ // Main method
def main(args : Array[String])
{
// Creating a list
val m 1 = List( 1 , 2 , 3 )
// Applying :: operator
val res = m 1 . :: ( "5" )
// Displays output
println(res)
}
} |
Output:
List(5, 1, 2, 3)
Example #2:
// Scala program of ::() // method // Creating object object GfG
{ // Main method
def main(args : Array[String])
{
// Creating a list
val m 1 = List( 1 , 2 , 3 )
// Applying :: operator
val res = m 1 . :: ( "1" )
// Displays output
println(res)
}
} |
Output:
List(1, 1, 2, 3)