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How to convert an ArrayList to String in Kotlin?
In this article, we will see how we can convert an ArrayList in Kotlin to a String. In order to do so, we will use a String function called joinToString() that is provided by the Kotlin library. Its definition goes like this −
fun <T> Array<out T>.joinToString( // the String will be separated by comma separator: CharSequence = ", ", // prefix to the String prefix: CharSequence = "", // postfix to the String postfix: CharSequence = "", // This number of elements will be printed; // the remaining will be denoted by truncated sequence limit: Int = -1, truncated: CharSequence = "...", // any transformation required over the String transform: ((T) -> CharSequence)? = null ): String
This function takes several attributes in order to convert an arrayList into a String.
Example – Converting an ArrayList to String
Now let's take a working example and convert an ArrayList to a String −
fun main(args: Array<String>) {
val mylist = listOf("Jam", "bread", "apple", "mango")
println("Input ArrayList: " + mylist)
println("ArrayList to String: " +
mylist.joinToString(
prefix = "[",
separator = "-",
postfix = "]",
truncated = "...",
transform = { it.uppercase() }
)
)
}Output
It will produce the following output −
Input ArrayList: [Jam, bread, apple, mango] ArrayList to String: [JAM-BREAD-APPLE-MANGO]
Updated on: 16-Mar-2022
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