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Scala List ::() operator with example
  • Last Updated : 26 Jul, 2019

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 m1 = List(1, 2, 3)
          
        // Applying :: operator
        val res = m1.::("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 m1 = List(1, 2, 3)
          
        // Applying :: operator
        val res = m1.::("1")
          
        // Displays output
        println(res)
      
    }
}
Output:
List(1, 1, 2, 3)



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