Updated: March 4, 2023
by Bernd

50+ Best Prompts to Learn Kotlin

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In this prompt list, you will find the best prompts to help you learn the Kotlin programming language. These prompts cover various aspects of Kotlin, such as basic vocabulary, grammar, collections, error handling, file handling, and concurrency.

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Basic Concepts

Learning the basics of Kotlin is the first step to mastering this programming language. This category will help you get started by providing prompts for learning basic vocabulary.

Create a variable named "age" and assign it the value of your age.
Write a Kotlin function that takes two parameters, an integer and a string. The function should return the string repeated by the integer number of times.
Create a Kotlin function that takes a list of integers as input and returns the sum of all the even integers in the list.
Generate a Kotlin program that prints all even numbers from 0 to 100.
Write a Kotlin program that asks the user to input a number and then prints out whether the number is positive, negative, or zero.
Create a Kotlin program that declares and initializes a list of strings. Then, use a for loop to print out each string in the list.
Write a Kotlin function that takes an array of integers as input and returns the largest integer in the array.
Create a Kotlin program that uses a while loop to print out all numbers from 1 to 10.

Grammar

Grammar is an important aspect of any language, including Kotlin. This category will provide prompts for learning the grammar rules of Kotlin.

Write a Kotlin program that declares and initializes a nullable string variable. Then, use an if statement to check if the variable is null, and if it is, print "The variable is null."
Create a Kotlin program that uses a when statement to check the value of a variable. If the value is "red", print "Stop". If the value is "yellow", print "Caution". If the value is "green", print "Go". If the value is anything else, print "Invalid signal".
Write a Kotlin function that takes an integer as input and returns true if the integer is even and false otherwise.
Create a Kotlin program that declares and initializes an array of strings. Then, use a for loop to print out each string in the array, but only if the string has more than 5 characters.
Write a Kotlin function that takes a string as input and returns the string reversed.
Create a Kotlin program that declares and initializes a list of integers. Then, use a for loop to print out each integer in the list, but only if the integer is greater than 10.
Write a Kotlin function that takes an array of integers as input and returns the sum of all the integers in the array.
Create a Kotlin program that uses a do-while loop to ask the user for a number between 1 and 10. Keep asking until the user enters a valid number.

Data Types

Understanding data types is essential for working with Kotlin. This category will provide prompts for learning the various data types in Kotlin.

Create a Kotlin program that declares and initializes a string variable. Then, print out the length of the string.
Write a Kotlin function that takes a string as input and returns the number of vowels in the string.
Create a Kotlin program that declares and initializes an integer variable. Then, print out the binary, octal, and hexadecimal representations of the integer.
Create a Kotlin program that declares and initializes a double variable. Then, print out the ceiling and floor of the variable using the ceil() and floor() functions.
Write a Kotlin function that takes a string as input and checks if it is a palindrome. A palindrome is a word that is the same forwards and backwards, such as "racecar" or "level".
Create a Kotlin program that declares and initializes a boolean variable. Then, use an if statement to check if the variable is true, and if it is, print "The variable is true."
Write a Kotlin function that takes a list of integers as input and returns the product of all the integers in the list.

Functions

Functions are an essential part of Kotlin programming. This category will provide prompts for learning how to create and use functions in Kotlin.

Create a Kotlin function that takes two numbers as input and returns their sum.
Write a Kotlin program that uses the "repeat" function to print "Hello, world!" 10 times.
Create a Kotlin program that declares and initializes a list of integers. Then, use a higher-order function such as "filter" or "map" to create a new list containing only the even integers from the original list.
Write a Kotlin function that takes a string as input and returns true if the string contains only digits (0-9) and false otherwise.
Create a Kotlin program that declares and initializes a string variable. Then, use the "with" function to manipulate the string, such as changing its case or adding characters.
Write a Kotlin function that takes a list of strings as input and returns the length of the longest string in the list.
Create a Kotlin program that uses a lambda expression to square each element in a list of integers.
Write a Kotlin function that takes two lists of integers as input and returns a new list containing the common elements between the two lists.

Classes

Classes are a fundamental concept in object-oriented programming, and Kotlin is no exception. This category will provide prompts for learning how to create and use classes in Kotlin.

Create a Kotlin class named "Person" with properties for "name" and "age". Then, create an instance of the class and print out the person's name and age.
Write a Kotlin program that declares and initializes a list of "Person" objects. Then, use a higher-order function such as "filter" or "map" to create a new list containing only the "Person" objects that are over a certain age.
Create a Kotlin interface named "Drawable" with a method named "draw". Then, create a class that implements the interface and implements the "draw" method.
Write a Kotlin program that uses inheritance to create a subclass of the "Person" class named "Student" with a property for "major". Then, create an instance of the "Student" class and print out the student's name, age, and major.
Create a Kotlin class named "BankAccount" with properties for "accountNumber", "balance", and "owner". Then, create methods for depositing and withdrawing money from the account.
Create a Kotlin class named "Shape" with a method named "area". Then, create subclasses for various shapes such as "Rectangle", "Circle", and "Triangle" that override the "area" method.
Write a Kotlin program that uses composition to create a class named "Car" with properties for "engine" and "transmission". Then, create instances of the "Engine" and "Transmission" classes and use them to create an instance of the "Car" class.

Collections

Collections are a crucial aspect of Kotlin programming, and this category will provide prompts for learning how to work with various collection types.

Create a Kotlin program that declares and initializes a set of strings. Then, use a for loop to print out each string in the set.
Write a Kotlin function that takes a list of integers as input and returns a new list containing only the unique integers in the original list.
Create a Kotlin program that declares and initializes a map with string keys and integer values. Then, use a for loop to print out each key-value pair in the map.
Write a Kotlin function that takes a list of strings as input and returns a new list containing only the strings that start with a vowel.
Create a Kotlin program that declares and initializes a list of integers. Then, use the "zip" function to combine the list with a list of strings, creating a list of pairs.
Write a Kotlin function that takes a map with string keys and integer values as input and returns the sum of all the values in the map.
Create a Kotlin program that declares and initializes a list of "Person" objects. Then, use the "groupBy" function to group the people by age.
Write a Kotlin function that takes a list of integers as input and returns a new list containing only the integers that are greater than the average of all the integers in the original list.

Error Handling

Error handling is an essential part of writing robust and reliable code in Kotlin. This category will provide prompts for learning how to handle errors in Kotlin.

Create a Kotlin program that declares and initializes a nullable integer variable. Then, use the "let" function to perform an action only if the variable is not null.
Write a Kotlin function that takes a string as input and returns an integer. Handle any exceptions that may be thrown if the input is not a valid integer.
Create a Kotlin program that declares and initializes a list of integers. Then, use the "firstOrNull" function to find the first even integer in the list, or null if there are no even integers.
Write a Kotlin function that takes a string as input and returns the string converted to a double. Handle any exceptions that may be thrown if the input is not a valid double.
Create a Kotlin program that uses the "try-catch" block to handle any exceptions that may be thrown when dividing two integers.
Write a Kotlin function that takes a list of integers as input and returns the maximum value in the list. Handle any exceptions that may be thrown if the list is empty.
Write a Kotlin function that takes a list of integers as input and returns the average of all the integers in the list. Handle any exceptions that may be thrown if the list is empty.

File Handling

Working with files is a common task in many programming projects, and Kotlin provides many convenient tools for file handling. This category will provide prompts for learning how to work with files in Kotlin.

Create a Kotlin program that reads a text file and prints out its contents.
Write a Kotlin function that takes a list of strings as input and writes them to a text file.
Create a Kotlin program that reads a CSV file containing integers and calculates the sum of all the integers in the file.
Write a Kotlin function that takes a CSV file as input and returns a list of "Person" objects, where each "Person" object represents a row in the CSV file.
Create a Kotlin program that reads a JSON file containing a list of "Person" objects. Then, use the "filter" function to create a new list containing only the "Person" objects that are over a certain age.
Write a Kotlin function that takes a list of "Person" objects as input and writes them to a JSON file.
Create a Kotlin program that reads a binary file containing integers and calculates the sum of all the integers in the file.
Write a Kotlin function that takes a binary file as input and returns a list of integers, where each integer represents a byte in the binary file.

Concurrency

Concurrency is an important topic in modern programming, and Kotlin provides many tools for working with concurrency. This category will provide prompts for learning how to work with concurrency in Kotlin.

Create a Kotlin program that uses a coroutine to print "Hello, world!" 10 times.
Write a Kotlin function that takes two integers as input and returns their product. Use the "suspend" keyword to create a coroutine that performs the multiplication.
Create a Kotlin program that uses a mutex to protect a shared resource, such as a list of integers.
Write a Kotlin function that takes a list of strings as input and performs a time-consuming operation on each string, such as hashing it. Use the "async" function to perform the operations concurrently.
Create a Kotlin program that uses a semaphore to limit the number of coroutines that can access a shared resource at the same time.
Write a Kotlin function that takes a list of URLs as input and downloads the content of each URL concurrently. Use the "withContext" function to switch to a different thread while performing the download.
Create a Kotlin program that uses a channel to communicate between coroutines. For example, you could create a producer coroutine that generates integers and a consumer coroutine that consumes them.
Write a Kotlin function that takes a list of integers as input and sorts them concurrently using the merge sort algorithm. Use the "launch" function to perform the sorting in a separate coroutine.