Updated June 20, 2023
Introduction to Scala Interview Questions And Answers
Scala is a general-purpose programing language providing support for functional programming and a robust static type system. Martin Ordersky designed it, and it first appeared on 20 January 2004. The file extension is scala or .sc. Scala combines object-oriented and functional programming in one concise, high-level language. Scala’s static types help avoids bugs in complex applications, and its JVM and JavaScript runtimes let you build high-performance systems with easy access to huge ecosystems of libraries. It runs on Java platforms.
Example
Hello, world program In Scala will be written like this:
Program:
object HelloWorld extends App {
println(“Hello, World!”)
}
For Compiling: scala HelloWorld.scala
Running: scala HelloWorld.
So if you are looking for a job related to Scala, you must prepare for the 2023 Scala Interview Questions. Though every Scala interview is different and the job scope is also different, we can help you with the top Scala Interview Questions and Answers, which will help you take the leap and get you to succeed in an interview.
Part 1 – Scala Interview Questions (Basic)
This first part covers basic Scala Interview Questions and Answers.
1. What is Scala?
Answer:
Scala stands for Scalable Language. It is a multi-paradigm programming language. It supports both Object-oriented and functional programming languages. Its runs on JVM(Java Virtual Machine).
2. What are the significant advantages of Scala?
Answer:
The significant advantages of Scala language are Exact code, flexible syntax, Support for all OOP features, More reusable code, and highly productive.
Give some examples of JVM Language. Answer:
Java, Scala, Groovy, and Closure are very popular for JVM.
3. What is the superclass of all classes in Scala?
Answer:
“Any” class is the superclass of all types in Scala.
4. What is the default access modifier in Scala?
Answer:
“Public” is the default access modifier in Scala.
5. What is similar between Scala Int and Java’s java.lang.integer?
Answer:
This first part covers basic Scala Interview Questions and Answers.
6. What is Null in Scala?
Answer:
Null is a Type in Scala. It is available in the Scala package as “scala. Null”.
Let us move to the following Scala Interview Questions And Answers.
7. What is the Unit in Scala?
Answer:
In Scala, a unit represents “No value” or “No Useful value.” In the package, it is defined as “scala. Unit”.
8. What are the value and var in Scala?
Answer:
Var stands for variable, and Val stands for value. Var is used to define. Mutable variables and matter can be reassigned after the creation of it. Val is used to define Immutable variables, which means the value cannot be reassigned once it’s created.
9. What is REPL in Scala?
Answer:
REPL stands for reading Evaluate Print Loop. Generally, we call it “Ripple.” It is an interpreter to execute scala code from the command prompt.
11. What is Scala “If..else”?
Answer:
Scala “If. Else” is an expression. We can be assigned it to a variable. For EG:
val year = if( count == 0) 2014 else 2015
12. What do you mean by Scala Map?
Answer:
These is the basic Scala Interview Questions that are asked in an interview. Scala map is a collection of key-value pairs wherein the value in a map is retrieved using a key. Values in a map are not unique, but keys are unique.
There are two types of maps: Mutable and Immutable.
13. What do you understand by a closure in Scala?
Answer:
The closure is the function in scale where the returned value of the function depends on one or more than one variable, which is defined outside the function.
Part 2 – Scala Interview Questions (Advanced)
Let us now have a look at the advanced scala Interview Questions.
14. What do you mean by Option in Scala?
Answer:
It is used for wrapping the missing value.
15. What is Scala Trait?
Answer:
It’s a special kind that enables Multiple Inheritance. For Eg:
trait MyTrait {
deff()
}
16. Give some examples of packages in Scala.
Answer:
lang, scala, scala.PreDef is the package in Scala.
Let us move to the next Scala Interview Questions And Answers.
17. What is the use of tuples in Scala?
Answer:
Scala tuple is used to combine the fixed number of the item together. Nature vice the tuple are immutable and can hold objects of different types. For Eg: Val myTuple = (1, “element”, 10.2)
18. What is the Monad in Scala?
Answer:
A Monad is an object in Scala which wraps another object.
19. In Scala, how will you format a string?
Answer:
The following way:
Val formatted= “%s %i”.format (mystring.myInt)
20. What is Scala Identifiers?
Answer:
There are four types of Scala Identifiers:
Alphanumeric identifiers
Operator identifiers
Mixed identifiers
Literal identifiers
21. What are the different types of Literals in Scala?
Answer:
The literals in scale are given below:
Integer Literals
Floating-point literals
Boolean Literals
Symbol Literals
Character Literals
String Literals
Multi-Line Stings
22. What is the latest version of Scala?
Answer:
Scala 2.12, which requires Java 8.
Let us move to the next Scala Interview Questions And Answers.
23. Which keyword is used to define a function in Scala?
Answer:
def keyword is used to define the function in Scala.
24. Differentiate Object and Class in Scala?
Answer:
An object is a singleton instance of the class. It does not need to be initiated by the developer.
25. What do you mean by Akka in Scala?
Answer:
Akka is a concurrency framework in Scala that uses Actor based model for building JVM applications.
26. How to compile and run a Scala program?
Answer:
Scala compiler scalac to compile Scala Program and scala command to run it.
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