What are few collections in Scala?

Other types aliased are Traversable, Iterable, Seq, IndexedSeq, Iterator, Stream, Vector, StringBuilder, and Range. The following figure shows all collections in package scala. collection . These are all high-level abstract classes or traits, which generally have mutable as well as immutable implementations.

Which is used to collect data in Scala?

Scala provides rich set of collection library. It contains classes and traits to collect data….Some Significant Methods of Traversable Trait.

Method	Description
def toSeq: Seq[A]	It converts this collection to a sequence.

What is immutable collection in Scala?

Scala collections systematically distinguish between mutable and immutable collections. A mutable collection can be updated or extended in place. This means you can change, add, or remove elements of a collection as a side effect. Immutable collections, by contrast, never change.

Is the collection of pairwise elements of the same type?

A set is a collection of pairwise different elements of the same type.

What is the use of case class in Scala?

A Scala Case Class is like a regular class, except it is good for modeling immutable data. It also serves useful in pattern matching, such a class has a default apply() method which handles object construction. A scala case class also has all vals, which means they are immutable.

Is Scala a programming language?

Scala Functions Scala is a pure Object-oriented programming language. So, It provides built-in functions and allows us to create user-defined functions as well. Functions are first-class values in Scala.

What is case class Scala?

What is Scala Case Class? A Scala Case Class is like a regular class, except it is good for modeling immutable data. It also serves useful in pattern matching, such a class has a default apply() method which handles object construction. A scala case class also has all vals, which means they are immutable.

What is the use of trait in Scala?

Traits are used to share interfaces and fields between classes. They are similar to Java 8’s interfaces. Classes and objects can extend traits, but traits cannot be instantiated and therefore have no parameters.

How do I declare a set in Scala?

Scala Set Example

import scala.collection.immutable._
object MainObject{
def main(args:Array[String]){
val set1 = Set() // An empty set.
val games = Set(“Cricket”,”Football”,”Hocky”,”Golf”) // Creating a set with elements.
println(set1)
println(games)
}

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.

How are collections defined in the Scala library?

Scala – Collections. Scala has a rich set of collection library. Collections are containers of things. Those containers can be sequenced, linear sets of items like List, Tuple, Option, Map, etc. The collections may have an arbitrary number of elements or be bounded to zero or one element (e.g., Option).

How to create a mutable collection in Scala?

Scala Collection. Scala provides rich set of collection library. It contains classes and traits to collect data. These collections can be mutable or immutable. You can use them according to your requirement. Scala.collection.mutable package contains all the mutable collections. You can add, remove and update data while using this package.

Is there an immutable class hierarchy in Scala?

Scala Immutable Collections Hierarchy. The scala.collection.immutable package contains all the immutable abstract classes and traits for collections. It is a trait and used to traverse collection elements. It is a base trait for all scala collections. It implements the methods which are common to all collections.

What is the uniform return type principle in Scala?

This behavior which is implemented everywhere in the collections libraries is called the uniform return type principle. Most of the classes in the collections hierarchy exist in three variants: root, mutable, and immutable. The only exception is the Buffer trait which only exists as a mutable collection.