Category : Scala | Sub Category : Scala Interview Questions | By Prasad Bonam Last updated: 2023-09-26 23:42:12 Viewed : 583
In Scala, you can create a List
that contains elements of different data types, including both strings and integers. Here are examples of creating such a mixed-type List
:
1. Using List
Constructor:
You can create a List
with mixed types using the List
constructor by providing elements of different types:
scalaval mixedList = List("Alice", 42, "Bob", 30, "Carol", 28)
In this example, mixedList
contains strings and integers.
2. Using ::
(Cons) Operator:
You can also build a mixed-type List
by adding elements using the ::
operator:
scalaval mixedList = "Alice" :: 42 :: "Bob" :: 30 :: "Carol" :: 28 :: Nil
In this example, Nil
represents an empty list, and the ::
operator is used to prepend elements to it.
3. Using List[Any]
:
If you want to explicitly specify the type of the List
as a mix of different types, you can use List[Any]
:
scalaval mixedList: List[Any] = List("Alice", 42, "Bob", 30, "Carol", 28)
Here, mixedList
is explicitly declared as a List[Any]
, which allows it to hold elements of any type.
Accessing Elements in a Mixed-Type List:
To access elements in a mixed-type List
, you can use indexing and pattern matching:
scalaval name = mixedList(0) // Access the first element val age = mixedList(1) // Access the second element val name2 = mixedList(2) // Access the third element mixedList.foreach { case s: String => println(s"A string: $s") case i: Int => println(s"An integer: $i") case _ => println("Other type") }
In this code, we access elements by index and use pattern matching to differentiate between string and integer elements.
Output:
phpA string: Alice
An integer: 42
A string: Bob
An integer: 30
A string: Carol
An integer: 28
This demonstrates how you can create a mixed-type List
in Scala, access its elements, and work with elements of different data types within the same list.