In Scala, a constant list is a collection that contains a fixed number of elements. Once a list is created, its elements cannot be added, deleted, or modified.
Here is an example of how to create a constant list in Scala:
val mylist = List("apple", "banana", "orange")
In this example, we have declared and initialized a constant list named mylist that contains the elements "apple", "banana", and "orange".
We can access elements of the list using their index position, like this:
println(mylist(0)) // prints "apple"
println(mylist(1)) // prints "banana"
println(mylist(2)) // prints "orange"
We can also use various methods provided by the List class to perform various operations on the list. Here are a few examples:
// adds two lists together to create a new list
val newList = mylist ++ List("grape", "kiwi")
println(newList) // prints List(apple, banana, orange, grape, kiwi)
// retrieves the length of the list
val length = mylist.length
println(length) // prints 3
// sorts the list in alphabetical order
val sortedList = mylist.sorted
println(sortedList) // prints List(apple, banana, orange)
Since a constant list is immutable, we cannot modify, add, or delete its elements directly. We can only create a new list by performing operations on it.