Exploring Kotlin Ranges with Examples

Ranges are used to express a series of number with a starting value and an ending value.

Kotlin Ranges could be useful in expression evaluation and looping statements. Usually in looping statements, a variable is created initially and is incremented/decremented through repetitions, and an expression is checked if the value is greater that or less than some limit value.

Instead of this boiler code, Kotlin Ranges could be used to repeat a set of statements, starting with a value on lower or upper limit and progressing towards upper or lower limit respectively.

Kotlin is a versatile and expressive programming language known for its conciseness and readability. One of its powerful features is ranges, which allow you to create sequences of values effortlessly.

In this article, we’ll dive into Kotlin ranges, understand their syntax, and explore various examples to demonstrate their utility.

What are Kotlin Ranges?

A range in Kotlin represents a sequence of values that can be iterated over. Ranges are inclusive, meaning they include both the start and end values. They are primarily used in loops and other scenarios where you need to generate or manipulate a sequence of values.

Creating a Range

In Kotlin, you can create a range using the .. operator. Here’s the basic syntax:

val range = startValue..endValue

For example:

val numbers = 1..5 // Creates a range from 1 to 5

Iterating Over a Range

Ranges can be used in loops to iterate through their values. For instance, to print all the numbers in our numbers range:

for (number in numbers) {

This will output:


Checking If a Value is in a Range

You can use the in operator to check if a value is within a specific range:

val x = 3
val isXInRange = x in numbers
println("Is $x in the range? $isXInRange")

This will output:

Is 3 in the range? true

Range Progression

Ranges can also have a specified step or progression. This means you can generate values with a specific interval between them. Here’s how to create a range with a step:

val evenNumbers = 2..10 step 2 // Generates even numbers from 2 to 10

Reversed Ranges

You can reverse a range by using the downTo keyword. For example:

val reversedRange = 5 downTo 1

Working with Characters

Ranges are not limited to numbers; you can also use them with characters. For instance:

val letters = 'a'..'z'


Kotlin ranges are a powerful tool for working with sequences of values. Whether you’re iterating through a range of numbers, checking if a value is within a specific range, or generating values with a step, ranges simplify these tasks. Understanding and using Kotlin ranges effectively can make your code more concise and readable.

In this article, we’ve covered the basics of Kotlin ranges, including how to create them, iterate over them, and perform various operations. Armed with this knowledge, you can leverage ranges to streamline your Kotlin programming and make your code more efficient.

Feel free to experiment with ranges in your Kotlin projects, and explore their versatility in solving a wide range of programming challenges. Happy coding!

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