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Home / Interview Subjects / Scala
WithoutBook LIVE Mock Interviews Scala Related interview subjects: 9

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Know the top Scala interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Know the top Scala interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 2

What is the purpose of the 'apply' method in Scala?

The 'apply' method is a special method in Scala that is invoked when an object is called like a function. It is often used to create objects without using the 'new' keyword.
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Ques 3

What is the difference between 'map' and 'flatMap' in Scala?

'map' applies a function to each element of a collection and returns a new collection of the results, while 'flatMap' applies a function that returns a collection to each element and flattens the results into a single collection.
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Ques 4

Explain the concept of immutability in Scala.

Immutability means that once an object is created, its state cannot be changed. In Scala, 'val' and immutable collections are used to create immutable data structures.
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Ques 5

What is a companion object in Scala?

A companion object is an object with the same name as a class and is defined in the same file. It is used to contain static methods and properties related to the class.
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Ques 6

What is a trait in Scala?

A trait is a collection of abstract and concrete methods that can be mixed into classes to provide additional functionality. Unlike classes, a class can extend multiple traits.
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Ques 7

Explain lazy evaluation in Scala.

Lazy evaluation is a strategy where the evaluation of an expression is delayed until its value is actually needed. It can improve performance by avoiding unnecessary computations.
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Ques 9

What is a partial function in Scala?

A partial function is a function that is not defined for every input value. It is defined only for a subset of possible input values using the 'isDefinedAt' method.
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Ques 10

What is the 'implicit' keyword used for in Scala?

The 'implicit' keyword is used to declare that a value can be automatically passed to a method or function parameter. It is often used in combination with implicits.
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Ques 12

Explain the concept of implicit conversions in Scala.

Implicit conversions allow the compiler to automatically convert one type to another if needed. They are defined using the 'implicit' keyword and are commonly used for enhancing existing types with new functionality.
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Ques 13

What is the 'sealed' keyword used for in Scala?

The 'sealed' keyword is used to restrict the inheritance of a class to the same file. It helps the compiler exhaustively check pattern matches, ensuring that all possible subclasses are covered.
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Ques 14

What is the 'View' in Scala collections?

The 'View' in Scala collections provides a lazy and non-strict version of a collection. It allows you to create a lightweight view on a collection without creating a new data structure.
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Ques 16

What is the purpose of the 'withFilter' method in Scala?

The 'withFilter' method is used in conjunction with 'for' comprehensions to enable lazy filtering of elements in a collection. It is similar to 'filter' but is evaluated lazily.
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Ques 17

What is the purpose of 'scalatest' in Scala?

'scalatest' is a popular testing framework for Scala. It provides a rich set of features for writing and executing tests, including support for behavior-driven development (BDD) and various testing styles.
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Ques 18

What is the purpose of the 'unapply' method in Scala?

The 'unapply' method is used in the context of pattern matching. It allows you to extract values from objects, making it a key component in creating custom extractors for pattern matching.
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