Skip to main content

How to check if an array is empty in Kotlin

How to check if an array is empty in Kotlin.

Here's a step-by-step tutorial on how to check if an array is empty in Kotlin:

Step 1: Declare an array​

First, you need to declare an array in Kotlin. You can declare an array using the arrayOf() function and initialize it with some elements. For example:

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

Step 2: Use the size property​

To check if an array is empty, you can use the size property. The size property returns the number of elements in the array. If the size is 0, it means the array is empty. Here's an example:

if (array.size == 0) {
    println("Array is empty")
} else {
    println("Array is not empty")
}

Step 3: Use the isEmpty() function​

Kotlin provides an isEmpty() function that you can use to check if an array is empty. The isEmpty() function returns true if the array has no elements, and false otherwise. Here's an example:

if (array.isEmpty()) {
    println("Array is empty")
} else {
    println("Array is not empty")
}

Step 4: Use the isNullOrEmpty() function​

If you want to check if an array is empty or null, you can use the isNullOrEmpty() function. The isNullOrEmpty() function returns true if the array is null or empty, and false otherwise. Here's an example:

val emptyArray: Array<Int>? = null

if (emptyArray.isNullOrEmpty()) {
    println("Array is null or empty")
} else {
    println("Array is not null or empty")
}

Step 5: Use the any() function​

If you want to check if an array has any elements, you can use the any() function. The any() function returns true if the array has at least one element, and false otherwise. Here's an example:

if (array.any()) {
    println("Array is not empty")
} else {
    println("Array is empty")
}

That's it! You now know how to check if an array is empty in Kotlin. You can choose the method that suits your needs best depending on whether you want to check for null, empty, or any elements in the array.