Difference Between Sequence and List in Scala

Scala is a compiler-based programming language invented in the year 2003. Scala supports functional programming and object-oriented programming.

A container data structure in Scala that contains one or more elements is known as a collection. The article will explain the difference between Scala’s Collections, the Sequence and List.

Using Sequence and List in Scala

Sequence is a trait that List implements, a type of collection where the elements are stored in an indexed manner. Sequence is guaranteed immutable.

List is a collection that works like a linked list data structure. Lists are immutable, but if we want a list that keeps changing constantly, ListBuffer can be used, which is mutable.

Scala’s sequence is equivalent to Java’s List, while Scala’s list is equivalent to Java’s LinkedList.

Syntax:

Sequence : var mySeq = Seq(elements)

list : var myList = List(elements)

Both collections can store information, yet the sequence has a few extra highlights over the list. In Scala, a list is a particular collection that is streamlined and regularly utilized in functional programming.

List Sample Code:

object MyClass {
    def main(args: Array[String]) {

        val myList : List[Int] = List(11,22,33,44,55,66,77,88,99)

        println("The list is "+ myList)
    }
}

Output:

The list is List(11, 22, 33, 44, 55, 66, 77, 88, 99)

Sequence Sample Code:

object MyClass {
    def main(args: Array[String]) {

        val mySequence : Seq[Int] = Seq(101,2020,303,404,505,606,770,808,909)

        println("The Sequence is "+ mySequence)
    }
}

Output:

The Sequence is List(101, 2020, 303, 404, 505, 606, 770, 808, 909)

Based on the above output, we can observe that in Scala, by default, sequence is initialized as a list.