The List.length function in Scala returns the number of elements in a list. In short, this function is used to get the current size of a list.
Figure 1 shows a visual representation of the List.length function:
list_name.length
// where the list_name is the name of the list object
This function does not require a parameter.
This function returns the number of elements in the List object and is used to get the current size of the list.
The following code shows how to use the List.length function in Scala:
import scala.collection.mutable.Mapobject Main extends App {//filled listvar list_1 = List(1,3,4,2,0)//list_1 elements and lengthprintln("The list_1 elements: " + list_1);println("The list_1 is empty: " + list_1.length);//empty listvar list_2 = List()//list_2 elements and lengthprintln("The list_2 elements: " + list_2);println("The list_2 is empty: " + list_2.length);}
The code above initializes two List objects: list_1 and list_2. The length function returns the size of both List objects, i.e., 5 and 0, respectively.