how to get index of item in arraylist in kotlin

To get the index of an item in an ArrayList in Kotlin, you can follow these steps:

  1. Create an ArrayList and add elements to it.
  2. Use the indexOf() function to find the index of the desired item.

Here's an example:

val arrayList = ArrayList<String>()
arrayList.add("Apple")
arrayList.add("Banana")
arrayList.add("Orange")

val index = arrayList.indexOf("Banana")
println("Index of 'Banana': $index")

In this example, we create an ArrayList called arrayList and add three elements to it: "Apple", "Banana", and "Orange". We then use the indexOf() function to find the index of the item "Banana" in the ArrayList. The index is stored in the variable index, and we print it out using println().

The output will be:

Index of 'Banana': 1

The indexOf() function returns the index of the first occurrence of the specified item in the ArrayList. If the item is not found, it returns -1.

Please note that the index is zero-based, so the first item has an index of 0, the second item has an index of 1, and so on.