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How to replace elements in an array with another element in Kotlin

How to replace elements in an array with another element in Kotlin.

Here is a detailed step-by-step tutorial on how to replace elements in an array with another element in Kotlin.

Step 1: Create an Array​

First, you need to create an array in Kotlin. You can create an array using the arrayOf() function. Here's an example of creating an array of integers:

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

Step 2: Replace Elements​

To replace elements in an array, you need to access the specific index of the array and assign a new value to it. Kotlin arrays are mutable, which means you can modify their elements. Here are a few different ways to replace elements in an array:

Option 1: Replace a Single Element​

To replace a single element in the array, you can use the assignment operator (=) to assign a new value to the desired index. Here's an example that replaces the second element (index 1) with a new value:

numbers[1] = 10

After executing this line of code, the numbers array will be [1, 10, 3, 4, 5].

Option 2: Replace Multiple Elements​

If you want to replace multiple elements in the array, you can use the set() function. The set() function takes two arguments: the index of the element to be replaced and the new value. Here's an example that replaces the second and third elements with new values:

numbers.set(1, 10)
numbers.set(2, 20)

After executing these lines of code, the numbers array will be [1, 10, 20, 4, 5].

Option 3: Replace Elements Using a Loop​

If you want to replace elements in the array based on a certain condition, you can use a loop to iterate over the array and replace elements that meet the condition. Here's an example that replaces all even numbers with zero:

for (i in numbers.indices) {
    if (numbers[i] % 2 == 0) {
        numbers[i] = 0
    }
}

After executing this loop, the numbers array will be [1, 0, 3, 0, 5].

Step 3: Print the Updated Array​

After replacing the desired elements in the array, you can print the updated array to verify the changes. You can use a loop or the joinToString() function to convert the array to a string and print it. Here's an example using the joinToString() function:

println(numbers.joinToString())

This will output the updated array: 1, 0, 3, 0, 5.

That's it! You have successfully replaced elements in an array with another element in Kotlin.