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:

#   
## Syntax
```scala
list_name.length
// where the list_name is the name of the list object
```
## Parameters
This function does not require a parameter.

## Return value
This function returns the number of elements in the `List` object and is used to get the current size of the list.

## Code
The following code shows how to use the `List.length` function in Scala:

import scala.collection.mutable.Map
object Main extends App {
  //filled list
  var list_1 = List(1,3,4,2,0)

  //list_1 elements and length
  println("The list_1 elements: " + list_1);
  println("The list_1 is empty: " + list_1.length);

  //empty list
  var list_2 = List()
  //list_2 elements and length
  println("The list_2 elements: " + list_2);
  println("The list_2 is empty: " + list_2.length);

}

## Explanation

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.

What is the List.length method in Scala?

The List.length function in Scala returns the number of elements in a list, indicating its size.