Kotlin Array Example

Kotlin Array is an ordered collection of similar type of values.

What is an Array?

An array is a data structure that can hold a fixed number of elements of the same data type. In Kotlin, you can create arrays of any data type, including numbers, strings, or custom objects.

An array in Kotlin is of fixed size. Once an array is declared of specific size, the size cannot be changed. In other words, we cannot add elements to the array, nor delete elements from the array.

The value of an element can be modified/updated.

In Kotlin, arrays are implemented via Array class.

Declaring and Initializing Arrays

To declare and initialize an array in Kotlin, you have a few options:

1. Using the arrayOf Function

You can create an array using the arrayOf function like this:

val numbers = arrayOf(1, 2, 3, 4, 5)

This creates an array of integers containing the values 1, 2, 3, 4, and 5.

2. Using the Array Constructor

Another way to create an array is by using the Array constructor:

val fruits = Array(5) { "" }
fruits[0] = "Apple"
fruits[1] = "Banana"
fruits[2] = "Orange"
fruits[3] = "Grape"
fruits[4] = "Cherry"

Here, we declare an array of strings with a size of 5 and initialize its elements individually.

Accessing Array Elements

You can access elements in an array using square brackets and the index of the element, like this:

val firstFruit = fruits[0]

This will store the value “Apple” in the firstFruit variable.

Modifying Array Elements

To modify an element in an array, simply assign a new value to the desired index:

fruits[1] = "Strawberry"

This code changes the second element of the fruits array from “Banana” to “Strawberry.”

Iterating Through an Array

You can loop through the elements of an array using a for loop or other methods like forEach:

for (fruit in fruits) {

This will print each fruit in the fruits array.

Array Size and Properties

You can find the size of an array using the size property:

val arraySize = fruits.size

You can also check if an array is empty using the isEmpty property:

val isEmpty = fruits.isEmpty()


Arrays are essential data structures in programming, and in Kotlin, they are easy to work with. You can create, modify, and iterate through arrays to store and manipulate data efficiently.

In this article, we covered the basics of working with Kotlin arrays, including declaration, initialization, accessing elements, modifying elements, and iterating through arrays. Armed with this knowledge, you can use arrays effectively in your web development projects, including building dynamic content for your website’s blog.

Remember that arrays are just one tool in Kotlin’s arsenal. Depending on your specific use case, you might also want to explore other data structures and collections available in Kotlin’s standard library to enhance the functionality of your website and blog. Happy coding!

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