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How to clone or copy a list in Kotlin?
A list is a type of collection in which data is stored in a sequential manner. We might come across a situation where the contents of one List have to be copied into another. In this article, we will see how to use Kotlin's built-in methods to clone a list.
Example - Using toList()
toList() is the basic method which can convert a collection into a list. We can use this method to clone an existing list too.
fun main(args: Array<String>) { val x = listOf(1,2,3,4,5,6,7,8,9) val copiedList=x.toList(); println("Given collection: " +x) println("Clone list: " +copiedList) }
Output
It will generate the following output
Given collection: [1, 2, 3, 4, 5, 6, 7, 8, 9] Clone list: [1, 2, 3, 4, 5, 6, 7, 8, 9]
Example - using toArray()
Cloning an existing collection can be done using the toArray() method.
fun main(args: Array<String>) { val array = arrayListOf("1", "2", "3", "4") val arrayCopy = array.toArray() print("The first element of the array: " +arrayCopy[0]) }
Output
In the above example, we are printing the array list using toArray(). We are printing the zeroth index value in the array.
The first element of the array: 1
Example - ArrayList()
Kotlin has a standard function called ArrayList() that can be used to copy one array into another. The following example demonstrates how to use it.
fun main(args: Array<String>) { val list = mutableListOf("a", "b", "c") val list2 = ArrayList(list) print(list2) }
Output
The above piece of code will copy the mutable list "list" into another empty list "list2".
[a, b, c]
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