How to convert an array to a list in Kotlin

How to convert an array to a list in Kotlin.

Here is a detailed step-by-step tutorial on how to convert an array to a list in Kotlin.

Step 1: Declare and initialize an array

First, you need to declare and initialize an array in Kotlin. An array is a fixed-size collection of elements of the same type. You can declare an array by specifying the type of elements it will hold, followed by square brackets ([]), and then assign values to it using the arrayOf() function.

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

In this example, we have declared an array of integers and assigned it the values 1, 2, 3, 4, and 5.

Step 2: Convert the array to a list

To convert an array to a list in Kotlin, you can use the toList() extension function. This function is available on the array object and returns a new list containing all the elements of the array.

val list = array.toList()

In this example, the array is converted to a list and assigned to the variable "list".

Step 3: Accessing the elements of the list

Once you have converted the array to a list, you can access its elements using the indexing operator ([]). The indexing starts from 0, so the first element of the list can be accessed using index 0.

val firstElement = list[0]

In this example, we are accessing the first element of the list and assigning it to the variable "firstElement".

Step 4: Modifying the list

After converting the array to a list, you can modify the list by adding, removing, or updating elements. Since the converted list is mutable, you can use standard list operations to modify it.

list.add(6) // Adds 6 to the end of the list
list.removeAt(0) // Removes the element at index 0 from the list
list[2] = 7 // Updates the element at index 2 to 7

In this example, we are adding the element 6 to the end of the list, removing the element at index 0, and updating the element at index 2 to 7.

Step 5: Iterate over the list

You can iterate over the elements of the list using various looping constructs in Kotlin, such as for loop, while loop, or forEach loop.

for (element in list) {
    println(element)
}

list.forEach { element ->
    println(element)
}

var index = 0
while (index < list.size) {
    println(list[index])
    index++
}

In these examples, we are iterating over the elements of the list and printing them to the console using different looping constructs.

That's it! You have successfully converted an array to a list in Kotlin. Now you can use the list for further processing or manipulation as per your requirements.