Scala Skill Assessment Quiz 2022 | LinkedIn Skill Assessment Quiz | LinkedIn | MNC Answers

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Scala

Q1. Scala bytecode can run on top of Java VM. What is the fundamental difference between Java object.clone() and Scala object.copy()?

•  One is a Java object, the other is a Scala object.
•  clone() will copy class structures but not the data, while copy() will also copy data into new objects.
•  There is no difference.
•  copy() allows you to change values during the copying process; clone() does not.

Q2. What value does this code return?

val m1 = Map("a"->1,"b"->2,"c"->3)
m1("a")

•  a
•  2
•  b
•  1

Q3. What is one way to avoid low-level parallelization details?

•  monads
•  literal functions
•  partially applied functions
•  parallel collections

Q4. What do you use in ScalaTest to see a detailed diagram of error messages when a test fails?

•  ArgumentExceptions
•  AssertionException
•  DiagrammedAssertions
•  JUnit

Q5. What data type would you use to store an immutable collection of objects that contain a fixed number of varying types?

•  Array
•  ImmutableCollection
•  List
•  Tuple

Q6. After defining a function in the interpreter, Scala returns the following. What does the () indicate?

myfnc: ()Unit

•  The function has no side effects.
•  The function takes no parameters.
•  The function returns no value.
•  Returning unit types to the function is a closures.

Q7. What type of number is 1234.e5?

•  hexadecimal
•  short
•  floating point
•  long

Q8. When you convert a map to a list using the toList method of the map, the result will be of which type?

•  List[(String, String)]
•  List[(Array, Array)]
•  List[(Collection, Collection)]
•  List

Q9. What type of object does this code create?

val x = (1234, "Active")

•  List
•  Map
•  Tuple
•  Array

Q10. Which is a subclass of all classes?

•  AnyVal
•  AnyRef
•  Method
•  Null

Null in Scala Standard library. The question is a bit incorrect - Null is a subtype of every type except those of value classes

Q11. For the for-yield construct, is the scope separate between for-body and yield-body?

•  Yes and no. It is different depending on the for construct and what it does.
•  Yes, because the for section does not expose its scope.
•  No, because for-yield shares the same scope, even though they are within separate curly braces.
•  Yes, because they are within different curly braces.

Example: yield-body has access to the e variable from the for-body

val a = Array(1, 2, 3, 4, 5)
for {
     e <- a if e > 2
} yield e

Q12. What is one way to implement pattern matching on methods?

•  using regex
•  using monads
•  using string matching
•  using case classes

Note: ambiguous question, it's not clear what kind of pattern matching is meant here.

Q13. What is the value of z after executing this code?

val y = List('a','b')
val z = y::List('c')

•  List(a,b,c)
•  List(List(a, b), c)
•  List(c,a,b)
•  List(c,List(a,b))

Q14. What term is used to specify a precondition?

•  assert
•  require
•  precondition
•  mustHave

Q15. Which Scala type may throw an exception or a successfully computed value, and is commonly used to trap and propagate errors?

•  scala.util.ExceptionHandling
•  scala.Catch.Throw
•  scala.exception.TryFinally
•  scala.util.Try

scala.util.Try

Q16. What is the data type of y after this code is executed?

val y = (math floor 3.1415 * 2)

•  short
•  double
•  int
•  bigInt

Q17. When using pattern matching, which character matches on any object?

•  %
•  _ [answer]
•  ^
•  -

Pattern Matching

Q18. You have created an array using val. Can you change the value of any element of the array—and why or why not?

•  Yes, the reference to the array is immutable, so the location that the array points to is immutable. The values in the array are mutable.
•  The 0th element is immutable and cannot be modified. All other elements can be modified.
•  Yes, val does not make arrays immutable.
•  No, val makes the array and values of the array immutable.

Explanation:

val a1 = Array(1, 2, 3)
a1{1} = 3 // OK
a1 = Array(1, 3, 3) // error: reassignment to val

Q19. What is the output of this function?

def main () {
     var a = 0
     for (a<-1 until 5){println(a)}

•  1,2,3,4,5
•  0,1,2,3,4
•  1,2,3,4
•  2,3,4,5

Q20. What do you call objects with immutable state?

•  singletons
•  stationary objects
•  functional objects
•  fixed objects

Note: singletons may have mutable state

Q21. You have written a Scala script. How would you access command-line arguments in the script?

•  use array named args
•  use tuple named args
•  use numbered variables with a _ prefix for example _ 1, _ 2, _ 3
•  use numbered variables with a $ prefix - for example $1, $2, $3

Q22. What does this code return? val x = 3; if (x > 2) x = 4 else x = x*2

•  4
•  an error
•  6
•  3

Q23. Which statement returns a success or a failure indicator when you execute this code?

val MyFuture = Future {runBackgroundFunction() }

•  myFuture.onComplete
•  myFuture(status)
•  myFuture.Finished
•  complete(myFuture)

Q24. To denote a parameter that may be repeated, what should you place after type?

•  %
•  &
•  _
•  - [answer]

Q25. What is called when a superclass has more than one subclass in Scala?

•  polyinheritance
•  multilevel inheritance
•  multimode inheritance
•  hierarchical inheritance

Q26. One way to improve code reliability is to use __ , which will evaluate a condition and return an error if the condition is violated.

•  packages
•  polymorphisms
•  assertions
•  traits

Q27. Which statement about if-else-if-else statements is true?

•  If the first else-if does not succeed, then no other else-ifs are tested.
•  If an else-if does not succeed, then none of the remaining else-if statements or else will be tested.
•  All else-if statements are tested in all cases.
•  If an else-if succeeds, then none of the remaining else-if statements or else will tested.

Q28. What do you call the process of changing the definition of an inherited method?

•  recursive methods
•  currying methods
•  redefining methods
•  overriding methods

Q29. To denote a parameter that may be repeated, what should you place after the type?

•  _
•  * [answer]
•  %
•  &

Repeated Parameters in Scala

Q30. What is the code below equivalent to?

myClass.foreach(println _)

•  myClass.foreach(println ())
•  myClass.foreach(print NIL)
•  myClass.loop(println ())
•  myClass.foreach(x => println(x))

Q31. What is an advantage of an immutable object?

•  Immutable objects use less memory than their mutable counterparts.
•  Immutable objects do not require error handling.
•  Immutable objects can be used in classes, mutable objects cannot.
•  Immutable objects are threadsafe.

Q32. You want to create an iteration loop that tests the condition at the end of the loop body. Which iteration would you use?

•  do-while loop
•  while loop
•  for loop
•  do-until loop

Q33. What can you use to make querying a database more efficient, by avoiding the need to parse the SQL string every time a query is executed from Scala?

•  database driver
•  connection
•  prepared statement
•  SQL view

PreparedStatement from Java which is also used in Scala

Q34. Which is not a member of the collections hierarchy?

•  Set
•  Seq
•  Hash
•  Map

Q35. Which term makes the contents of packages available without prefixing?

•  use
•  include
•  import
•  assertion

Q36. If you wanted to find the remainder after division, what operator would you use?

•  %
•  DIV
•  //
•  /

Q37. What are defined inside a class definition?

•  method
•  fields and methods
•  fields, methods, and packages
•  fields

Q38. What defines methods and fields that can then be reused by mixing into classes?

•  singleton
•  assertion
•  trait
•  monad

Q39. When do you need to explicitly state the return type in a function definition?

•  when the function has no side effects
•  when the function returns a Unit type
•  when the function is recursive
•  when the function has side effects

Q40. Why would you make a field private?

•  so only methods in the same file can access the field
•  so only methods in the same package can access the field
•  so only methods in the same class could access the field
•  so only methods defined in a Java class can access the field

Q41. What's the difference between .equals and ==?

•  They do the exact same thing
•  == won't work on objects
•  == cannot be applied to String
•  == is a wrapper of .equals() and checks for nulls

Source:

Q42. What is denotes the intersection between two sets?

•  ||
•  &&
•  &
•  %

Source:

Q43. What do you call a function defined in a block?

•  private function
•  block function
•  local function
•  method

Q44. What do you call a Scala method that is parametrized by type as well as by value?

•  multimode method
•  polymorphic method
•  closure
•  collection method

Q45. What type of exception is thrown when a precondition is violated?

•  IllegalArgumentException
•  NumberFormatException
•  NullPointerExcepetion
•  MalformedParameterException

Q46. In scala what is precondition?

•  a constraint on where a method may be called from
•  a constraint on values passed to a methode constructor
•  a class of predifined error messages
•  a class of Boolean operators

Q47. What would you change in this code to make it execute in parallel?

 val myNums = (1 to 500).toList
 list.map(_ + 1)

•  Change list.map to list.par.map.
•  Change toList to toListPar
•  Change val to val.par
•  Change toList to toParallelList

Q48. What is a free variable?

•  a variable defined outside a function
•  a variable referenced in a function that is not assigned a value by that function
•  a variable that has a global scope
•  a variable defined in a class and available to all methods in that class

Q49. What's the best way to execute code in the background in a separate thread?

•  AltThread
•  AltFuture
•  AltProcess
•  Future

Q50. What value does this code return?

x= List(1,2,4); x(1)?

•  (1,2,4)
•  1
•  Nil
•  2

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