Scala interview questions for data Engineer

Prem Vishnoi(cloudvala)

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Jun 26, 2024

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1. What is Scala, and how does it differ from Java?

• Answer: Scala is a general-purpose, high-level programming language that combines object-oriented and functional programming paradigms.
• It runs on the Java Virtual Machine (JVM) and is fully interoperable with Java.

Key differences includes:

• Functional Programming: Scala supports functional programming constructs such as first-class functions, immutable data structures, and higher-order function.
• Type Inference: Scala has a strong static type system with type inference, reducing the need for explicit type declarations.
• Conciseness: Scala code tends to be more concise than Java code, due to its expressive syntax and powerful language features like pattern matching and higher-order functions.

2. What are case classes in Scala, and why are they useful?

• Answer: Case classes in Scala are special types of classes that are immutable by default and come with built-in methods for pattern matching, equality checks, and copying. They are useful for:

• Pattern Matching: Simplifies the use of pattern matching with their auto-generated unapply method.
• Immutability: Encourages immutable data structures by…