Kotlin Kotlin Functions and Lambdas 3

Question 1

What is an anonymous function in Kotlin?

Accepted Answer

A function declared with `fun` but without a name

Answer

An anonymous function uses the `fun` keyword without a name and supports explicit `return` statements, unlike lambdas.

Question 2

Which Kotlin function returns only elements of a collection that satisfy a predicate?

Accepted Answer

filter

Answer

`filter` returns a new collection containing only elements for which the given predicate returns true.

Question 3

What does the `fold` function do in Kotlin?

Accepted Answer

Accumulates a value starting from an initial value

Answer

`fold` accumulates a result by applying an operation to each element along with a running accumulator, starting from an initial value.

Question 4

What is a closure in Kotlin?

Accepted Answer

A lambda that captures variables from its enclosing scope

Answer

A closure is a lambda or function literal that captures and can access variables from the surrounding scope.

Question 5

How do you define a default parameter value in a Kotlin function?

Accepted Answer

fun greet(name: String = "World")

Answer

Default parameter values are assigned using `=` after the type declaration, with the value being a valid Kotlin expression.

Kotlin Practice Test