# 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]