Scala Programming Quiz Questions and Answers
Embark on a journey through the world of Scala programming with our challenging Scala Programming Quiz! Whether you're a seasoned developer or just stepping into the realm of functional programming, this quiz offers a diverse set of questions that explore Scala's features, syntax, and concepts. Test your knowledge of pattern matching, higher-order functions, immutability, and more.
Engage in a fun and educational experience that will not only assess your Scala prowess but also enhance your understanding of this powerful language. Dive into the intricacies of Scala and emerge with a deeper appreciation for its elegance and flexibility. Are you ready to Read moreconquer the Scala Programming Quiz? Let the coding adventure begin!
Scala Programming Questions and Answers
- 1.
What is the output of println("Hello, World!") in Scala?
- A.
Prints “Hello, World!” to the console
- B.
Returns “Hello, World!”
- C.
Compiles with an error
- D.
None of the above
Correct Answer
A. Prints “Hello, World!” to the consoleExplanation
println is a built-in function in Scala that prints the given argument followed by a newline to the standard output, which is typically the console. It’s a side-effecting function, meaning it changes the state of the world outside the function (in this case, the console).Rate this question:
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- 2.
What does val keyword mean in Scala?
- A.
Mutable variable
- B.
Immutable variable
- C.
Function declaration
- D.
Class declaration
Correct Answer
B. Immutable variableExplanation
val is used to declare a variable that is immutable, meaning its value cannot be changed once assigned. This is in contrast to var, which declares a mutable variable. Immutability is a key feature of functional programming, which Scala supports.Rate this question:
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- 3.
What is the correct syntax to define a function in Scala?
- A.
Def functionName() = {}
- B.
FunctionName() {}
- C.
Def functionName: () {}
- D.
FunctionName() = def {}
Correct Answer
A. Def functionName() = {}Explanation
Functions in Scala are defined using the def keyword, followed by the function name, parameters (if any), and the function body. The return type of the function can be inferred by the compiler, or explicitly stated after a colon.Rate this question:
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- 4.
What is a case class in Scala?
- A.
A class that can be used in pattern matching
- B.
A class that can handle exceptions
- C.
A class that can be serialized
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
A case class in Scala is a special kind of class that comes with some useful default methods and can be used in pattern matching, can handle exceptions, and can be serialized. Case classes are good for modeling immutable data and are automatically equipped with natural equality, a nice toString method, and the ability to be used in “match” expressions.Rate this question:
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- 5.
What is Option in Scala?
- A.
A collection that contains exactly one element
- B.
A collection that contains zero or one elements
- C.
A collection that contains one or more elements
- D.
A collection that contains zero or more elements
Correct Answer
B. A collection that contains zero or one elementsExplanation
Option in Scala represents optional values. It can either contain a value (Some) or no value (None). It’s a way of dealing with null values, avoiding NullPointerExceptions. Instead of returning null, you can return None, and the caller of the function is forced to deal with the possibility that there might not be a value.Rate this question:
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- 6.
What is the purpose of flatMap function in Scala?
- A.
To flatten a nested collection
- B.
To map a function over a collection
- C.
To filter a collection
- D.
All of the above
Correct Answer
A. To flatten a nested collectionExplanation
flatMap in Scala is used to flatten a nested collection. It first applies a function to all elements of a collection and then flattens the results. This is useful when you have a collection of collections and you want to create a single collection that contains all the elements.Rate this question:
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- 7.
What is Unit in Scala?
- A.
A data type representing no value
- B.
A data type representing one value
- C.
A data type representing multiple values
- D.
A data type representing any value
Correct Answer
A. A data type representing no valueExplanation
Unit in Scala is a subtype of AnyVal and is used to represent a value that carries no meaningful information. It’s similar to void in Java. It’s used as the return type of a method that doesn’t return a meaningful value.Rate this question:
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- 8.
What is trait in Scala?
- A.
A data type
- B.
A function
- C.
An interface
- D.
A class
Correct Answer
C. An interfaceExplanation
trait in Scala is a type of interface that can have both abstract and non-abstract methods. It’s similar to an interface in Java, but with more features. Traits can be mixed into classes to provide additional functionality, and they can also require that a certain interface be implemented.Rate this question:
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- 9.
What is List in Scala?
- A.
A mutable collection
- B.
An immutable collection
- C.
A mutable map
- D.
An immutable map
Correct Answer
B. An immutable collectionExplanation
List in Scala is an immutable collection that represents a linked list. Once a List is created, it cannot be changed. This is in contrast to ArrayBuffer, which is a mutable collection. Immutable collections are safe to use in a multi-threaded environment, as they can’t be changed after they’re created.Rate this question:
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- 10.
What is ArrayBuffer in Scala?
- A.
A mutable array
- B.
An immutable array
- C.
A mutable list
- D.
An immutable list
Correct Answer
A. A mutable arrayExplanation
ArrayBuffer in Scala is a mutable collection that represents an array. It provides constant time access and modification of elements. This is in contrast to List, which provides constant time access and modification at the front of the list, but not at the end or in the middle.Rate this question:
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Current Version
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Feb 07, 2024Quiz Edited by
ProProfs Editorial Team -
Feb 05, 2024Quiz Created by
Smriti Singh
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