Scala Interview Questions and Answers
What is Scala?
Scala is a general-purpose programming language. It supports object-oriented, functional and imperative programming approaches. It is a strong static type language. In Scala, everything is an object whether it is a function or a number. It was designed by Martin Odersky in 2004.
Is Scala open source?
Yes! Scala is an open source project.
What are the advantages of Scala?
Among various other benefits of the language, there are few-
- 1. It is easy to write, compile, debug and run the program
- 2. It is highly scalable, testable, maintainable and productive
- 3. Your code is more concise, readable and error-free
- 4. It facilitates concurrent programming
- 5. It is both object-oriented and functional
- 6. It has no boilerplate code
- 7. Singleton objects are a cleaner solution than static
- 8. Scala arrays use regular generics
- 9. Scala has native tuples and concise code
What is the Main drawback of Scala Language?
1 1. Hard to learn
2. Scala has a limited developer pool.
3. Limited community presence
4. Lack of ease of adoption
5. Limited backward compatibility
2. Scala has a limited developer pool.
3. Limited community presence
4. Lack of ease of adoption
5. Limited backward compatibility
What are the features of Scala?
There are following features in Scala:
- Type inference
- Singleton object
- Immutability
- Lazy computation
- Case classes and Pattern matching
- Concurrency control
- String interpolation
- Higher order function
- Traits
- Rich collection set
When to use Scala?
1. Solve concurrency problems
2. Perform DSL related tasks
3. Implement functional solutions
4. Integrate with shared resources, files, databases or multiple backend processes, and services
5. Learn a new development paradigm
Is Scala easy to learn?
It is harder to learn than Java but easy to learn for a Java programmer.
Which is the latest version?
The latest version of Scala 2.12.7
Which keyword is used to define a function in Scala?
The “def” keyword is used to define the Scala function.
What is Type Inference in Scala?
Scala has a built-in type inference mechanism which allows the programmer to omit certain type annotations.
Why Scala is used in spark?
Spark is written in Scala and because of its scalability on JVM.
Scala is better than many other traditional data analysis tools like R or Python.
Why do we need App in Scala?
The app is a helper class that holds the main method.
Is Scala a functional language?
Scala is a multi-paradigm programming language; it supports imperative and functional style.
What is the Default access modifier in Scala?
The “Public” is the default access modifier in Scala.
What are Scala Identifiers?
Four types of Scala Identifiers-
1. Alphanumeric identifiers
2. Operator identifiers
3. Mixed identifiers
4. Literal identifiers
What is functional programming?
Functional programming is a style of programming where pure functions and immutable values are the basic building blocks.
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