Kotlin Kotlin Functional Programming 2

Question 1

What is the `also` scope function used for in Kotlin?

Accepted Answer

Performing side effects on an object and returning the object itself

Answer

Transforming an object and returning the result

Answer

Replacing the object with a new value

Answer

Executing a block only if non-null

Question 2

What is the difference between `apply` and `also` in Kotlin?

Accepted Answer

`apply` uses `this` and returns the object; `also` uses `it` and returns the object

Answer

No difference

Answer

`apply` returns a transformed result; `also` returns the original

Answer

`apply` is for nullables; `also` is for non-nullables

Question 3

What does `run` scope function do when called on an object in Kotlin?

Accepted Answer

Calls a lambda with the object as `this` and returns the lambda result

Answer

Starts a coroutine

Answer

Returns the object unchanged

Answer

Prints the object to console

Question 4

What is tail recursion in Kotlin and how is it enabled?

Accepted Answer

Recursive calls optimized by the compiler using the `tailrec` modifier to avoid stack overflow

Answer

Recursion using a list as a stack

Answer

Calling a function from the end of another function

Answer

Recursion with memoization

Question 5

What is a function type in Kotlin?

Accepted Answer

A type that represents a function signature, e.g., (Int) -> String

Answer

A type that describes a class method

Answer

A generic type parameter

Answer

An interface with one method

Question 6

What does `with` scope function do in Kotlin?

Accepted Answer

Calls a lambda with an object as `this` and returns the lambda result, without being an extension function

Answer

Creates a new scope with imports

Answer

Wraps an object in a nullable container

Answer

Executes code only if the object is non-null