How do I create a list in Scala?

How do I create a list in Scala?

Scala List Example

1. import scala.collection.immutable._
2. object MainObject{
3. def main(args:Array[String]){
4. var list = List(1,8,5,6,9,58,23,15,4)
5. var list2:List[Int] = List(1,8,5,6,9,58,23,15,4)
6. println(list)
7. println(list2)
8. }

What is the difference between SEQ and list in Scala?

A Seq is an Iterable that has a defined order of elements. Sequences provide a method apply() for indexing, ranging from 0 up to the length of the sequence. Seq has many subclasses including Queue, Range, List, Stack, and LinkedList. A List is a Seq that is implemented as an immutable linked list.

Are lists immutable in Scala?

First, lists are immutable, which means elements of a list cannot be changed by assignment. Second, lists represent a linked list whereas arrays are flat. The type of a list that has elements of type T is written as List[T].

How does Scala process lists?

There are generally four ways to process a list: iteration, traditional recursion, tail recursion, and pipelines.

How do you create an empty list in Scala?

As mentioned in an above answer, the Scala List is an immutable collection. You can create an empty list with . empty[A] . Then you can use a method :+ , +: or :: in order to add element to the list.

How do I add elements to a Scala list?

List in scala are some like array which store elements of same type only. Scala list internally uses linked list and as we know linked list are better suited for manipulation operation. To append or add any elements inside the list object directly we cannot do so because the list is immutable.

Is a Scala list ordered?

In Scala we do not sort Lists in-place. They are immutable. But we use lambda expressions, and the Ordering type, to create sorted copies of these lists.

How do I remove an item from a list in Scala?

How to delete elements from a list in Scala?

1. Using -= operator.
2. Using remove() method.
3. Using –= operator (deletes elements of another collection)

How do I convert a list to map in Scala?

In Scala, you can convert a list to a map in Scala using the toMap method. A map contains a set of values i.e. key-> value but a list contains single values. So, while converting a list to map we have two ways, Add index to list.

Is Scala list ordered?