Syntax error How to convert an ArrayList to String in Kotlin?

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: 2022-03-16T13:29:18+05:30

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