Kotlin Kotlin Functional Programming 3

Question 1

What is memoization and can it be implemented in Kotlin?

Accepted Answer

Caching function results for reuse; yes it can be implemented using maps or delegates

Answer

Memoization caches the results of expensive function calls; in Kotlin it can be implemented with a `HashMap` or using delegates like `lazy`.

Question 2

What is currying in functional programming as applied to Kotlin?

Accepted Answer

Transforming a multi-argument function into a sequence of single-argument functions

Answer

Currying converts a function `f(a, b)` into `f(a)(b)`, where each call returns a new function waiting for the next argument.

Question 3

What is a pure function in functional programming?

Accepted Answer

A function that always returns the same output for the same input and has no side effects

Answer

A pure function is deterministic and side-effect free: the same inputs always produce the same output without modifying external state.

Question 4

What is partial application in Kotlin?

Accepted Answer

Calling a function with fewer arguments than required and getting a new function for the rest

Answer

Partial application fixes some arguments of a function, returning a new function that accepts the remaining arguments.

Question 5

How does Kotlin handle immutability at the collection level?

Accepted Answer

Kotlin provides separate read-only and mutable collection interfaces, but underlying implementations may be mutable

Answer

Kotlin's `List`, `Set`, and `Map` interfaces are read-only views, but the underlying object may be a mutable Java collection.

Kotlin Practice Test