The result of the if is either Unit in the case of index 2 0 because the setter for age returns a Unit. In your case, the return value of the Lambda is the if (as most items are expressions in Kotlin). It then adds the result of the Lambda to the new list. In this Kotlin Tutorial, we learned how to filter a List using a condition/predicate with access to index in the predicate, using filterIndexed() function, with the help of examples. The mapIndexed will pass each item, and its index into the Lambda. Output Original List : įiltered List : Conclusion Var filteredList = myList.filterIndexed(') It returns the index of an element which will be returned by a subsequent call to the next () function.

Using ListIterator A simple solution is to use the nextIndex () function from the iterator returned by the ListIterator. In the following program, we will take a List of Integers and filter the numbers based on the condition formed using index and the element. This article explores different ways to traverse a list with the index in Kotlin. Therefore, we can fall filterIndexed() function on a List, or a Mutable List. The original list on which filterIndexed() function is called, remains unchanged. List.filterIndexed() function returns a List.Įlements of the List that return true for the given predicate, make it to the filtered List. Predicate is a lambda function that takes the index and element of the List as parameter and returns a boolean value. The syntax to call filterIndexed() function on a List with a predicate is List.filterIndexed(predicate)

With index kotlin