linkedin Kotlin assessment answers
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linkedin Kotlin assessment answers
LinkedIn Kotlin Assessment Answers
The LinkedIn Skill Assessments feature allows you to demonstrate your knowledge of the skills you’ve added to your profile. Job posters on LinkedIn can also add Skill Assessments as part of the job application process. This allows job posters to more efficiently and accurately verify the crucial skills a candidate should have for a role.
The topics in the Kotlin assessment include:
- Classes and Objects
- Collections
- Functions
- Basics
- Control Flow
- Coroutines
- Operators
- Null Safety
- Destructuring
- Reflection
Question Format
Multiple Choice
Language
English
LinkedIn Kotlin Assessment Questions and Answers
- .withIndex() (reference)
- .forEachIndexed()
- .forEach()
- .forIndexes()
- Classes are initialized in the same order they are in the file, therefore, Aircraft should appear after Airplane
- The code needs to pass the parameter to the base class’s primary constructor. Since it does not, it receives a null
- The abstract function always returns null
- A superclass is initialized before its subclass. Therefore, the name has not been set before it is rendered
- Only abstract classes are inheritable by subclasses
- Only abstract classes can inherit from multiple superclasses
- Only abstract classes can have abstract methods
- Only abstract classes can store state reference
- The variable is named it
- The variable is named this reference
- The variable is named receiver
- The variable is named default
- println(add(5,10).invoke())
- println(::add.invoke(5, 10)) (reference)
- println(::add.invoke{5, 10})
- println(add.invoke(5,10))
- fun static main(){}
- fun main(){}
- fun Main(){}
- public static void main(){}
- a do..while loop (reference)
- a for loop
- a while loop
- a forEach loop
- While the code runs, it does not produce correct results
- The integer is always a class
- The compiler runs an implicit .toClass() method on the integer
- The integer is autoboxed to a Kotlin Int class
- task.join()
- task.abort()
- job.stop()
- task.cancel() (reference)
- You must wrap all implicit conversion in a try/catch block
- You can only assign Long to an Int, not the other way around
- There is no implicit conversion from Int to Long (reference)
- All integers in Kotlin are of type Long
- 3,4,5,6
- in 3..6 (reference)
- 3 : 6
- {3,4,5,6}
- instance of
- is (reference)
- typeof
- as
- A null pointer exception is thrown
- firstName is equal to null (reference)
- firstName is equal to an empty string
- firstName is equal to Boolean false
- The code will give a stack overflow error
- The compiler warns of insignificant performance impact (reference)
- The compiler warns of significant memory usage
- The code is significantly faster
- count in 1..10
- count in 2..10 step 2 (reference)
- count in 1..10 % 2
- var count=2; count <= 10; count+=2
- 3 (reference)
- 4
- 1
- 5
- println(b!!.length ?: 0)
- println(b?.length ?: 0)
- println(b?.length ?? 0)
- println(b == null? 0: b.length)
- ::removeBadValues (reference)
- GlobalScope.removeBadValues()
- Mainkt.removeBadValues
- removeBadValues
- for(z in 1..7) println(“$z “)
- for(z in 1..6) print(“$z “) (reference)
- for(z in 1 to 6) print(“$z “)
- for(z in 1..7) print(“$z “)
- an anonymous object
- a static property
- a companion object (reference)
- a backing field
- as? (reference)
- ??
- is
- as
- To inherit from a class, it must be marked open (reference)
- To inherit from a class, it must be marked public
- To inherit from a class, it must be marked sealed
- To inherit from a class, it must be marked override
- change()
- modify()
- set() (reference)
- assign()
- Employee.display()
- ::display()
- super.display() (reference)
- override.display()
- StatusError is an object, not a class, and cannot be instantiated (reference)
- Only one instance of the class Status can be instantiated at a time
- Status. The error must be declared as an immutable type
- Status. Error is private to the class and cannot be declared externally
- You cannot assign a sequence to a variable
- To produce a result, a sequence must have a terminal operation. In this case, it needs a .toList() (reference)
- The .filter{ it < 11 } should be .filter{ it > 11 }
- The yieldAll(1..20) should be yieldAll(1..10)
- equals(), hashCode(), and toString() (reference)
- equals(), toHash(), and super()
- print(), println(), and toString()
- clone(), equals(), and super()
- object DatabaseManager {} (reference)
- singleton DatabaseManager {}
- static class DatabaseManager {}
- data class DatabaseManager {}
- The subclass must be marked sealed
- You must override the display job() method (reference)
- You must mark the subclass as final
- An abstract class cannot be extended, so you must change it to open
- Use import to change the type name (reference)
- Create subtypes with shorter names
- Create interfaces with shorter names
- Create extension classes with shorter names
- obj.classInfo()
- obj.typeInfo()
- obj::class.simpleName
- obj::class (reference)
- val arrs[5]: Int
- val arrs = IntArray(5) (reference)
- val arrs: Int[5]
- val arrs = Array<Int>(5)
- internal (reference)
- private
- public
- protected
- == determines if two primitive types are identical. === determines if two objects are identical
- == determines if two references point to the same object. === determines if two objects have the same value
- == determines if two objects have the same value. === determines if two strings have the same value
- == determines if two objects have the same value. === determines if two references point to the same object (reference)
- val max3 = a.max(b)
- val max = a > b ? a : b
- val max = if (a > b) a else b
- if (a > b) max = a else max = b
- println(Signal.SENDING.position())
- println(Signal.SENDING.hashCode())
- println(Signal.SENDING)
- println(Signal.SENDING.ordinal) (reference)
- const is compatible with Java, but @JvmField is not
- The compiler will inline const so it is faster and more memory efficient (reference)
- Virtually any type can be used with const but not @JvmField
- const can also be used with mutable types
- Replace open with closed
- Replace open with sealed (reference)
- Replace open with private
- Replace open with the public
- Delegates.watcher()
- Delegates.observable() (reference)
- Delegates.rx()
- Delegates.observer()
- infix function must be marked public
- In Kotlin, add is a keyword
- Extension functions use it, not this, as the default parameter name
- infix functions cannot have default values (reference)
- val name = null
- var name: String
- val name: String
- val name: String? = null
- val len = x?.let{x.len} else {-1}
- val len = x!!.length ?: -1
- val len:Int = (x != null)? x.length : -1
- val len = x?.length ?: -1
- The extension function should be marked public
- Add the prefix operator to the shouldMatch extension function
- The code is not legal in Kotlin (should be println(msg.shouldEqual(“test message”)))
- Add the prefix infix to the shouldMatch extension function
- Since COLOR and SIZE are both immutable, they are identical internally
- Both are immutable, but the use of the keyword const makes COLOR slower and less space-efficient than SIZE
- const makes COLOR faster but is not compatible with Java. Without const, SIZE is still compatible with Java
- Both are immutable, but the use of the keyword const makes COLOR faster and more space-efficient than SIZE (reference)
- Because the name is a class parameter, not a property-it is unresolved main().
- To create an instance of a class, you need the keyword new
- The reference to name needs to be scoped to the class, so it should be this. name
- Classes cannot be immutable. You need to change var to Val
- for( (ndx, value) in (1..20).withIndex() ){ (reference)
- for( (ndx, value) in (1..20).pair() ){
- for( Pair(ndx, value) in 1..20 ){
- for( (ndx, value) in *(1..20) ){
- a.from(b)
- a.range(b)
- a.rangeTo(b) (reference)
- a.to(b)
- proj.0
- proj[0]
- proj[1]
- proj.component1() (reference)
- with()
- yield() (reference)
- skip()
- return()
- y must be declared with var to be mutable
- y is an implicitly immutable value
- y can change only in a while loop
- To change y, it must be declared outside of the loop
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