Kotlin Kotlin Functional Programming

Question 1

What is a lambda expression in Kotlin?

Accepted Answer

An anonymous function literal that can be stored in a variable or passed as an argument

Answer

A named function

Answer

A class with a single method

Answer

A type alias

Question 2

What does `it` refer to inside a Kotlin lambda?

Accepted Answer

The implicit single parameter of the lambda

Answer

The outer class instance

Answer

The last expression value

Answer

The return type

Question 3

What is a higher-order function in Kotlin?

Accepted Answer

A function that takes functions as parameters or returns a function

Answer

A function with more than 3 parameters

Answer

A recursive function

Answer

A function defined inside a class

Question 4

What is function composition in Kotlin?

Accepted Answer

Combining two functions into a new function where one's output is the other's input

Answer

Calling multiple functions in sequence

Answer

Defining a function inside another function

Answer

Overloading functions

Question 5

What does the `let` scope function do in Kotlin?

Accepted Answer

Calls a lambda with the object as its argument and returns the lambda result

Answer

Declares a block of code

Answer

Modifies the object in place

Answer

Creates a copy of the object

Question 6

What is a closure in Kotlin?

Accepted Answer

A lambda that captures variables from its surrounding scope

Answer

A sealed class

Answer

A function that closes a stream

Answer

A private inner class