Kotlin List maxOf()
Syntax & Examples

Syntax of List.maxOf()

The syntax of List.maxOf() extension function is:

fun <T> Iterable<T>.maxOf(selector: (T) -> Double): Double

This maxOf() extension function of List returns the largest value among all values produced by selector function applied to each element in the collection.


✐ Examples

1 Example

In this example,

  • We create a list of doubles named list containing elements 1.5, 2.5, 3.5, 4.5, 5.5.
  • We use the maxOf() function with a selector function that returns the element itself.
  • The maximum value in the list, max, is printed to standard output using println statement.

Kotlin Program

fun main(args: Array<String>) {
    val list = listOf(1.5, 2.5, 3.5, 4.5, 5.5)
    val max = list.maxOf { it }
    println("Maximum value: \$max")
}

Output

Maximum value: 5.5

2 Example

In this example,

  • We create a list of characters named list containing elements 'a', 'b', 'c'.
  • We use the maxOf() function with a selector function that converts each character to its ASCII value.
  • The maximum value in the list, max, is printed to standard output using println statement.

Kotlin Program

fun main(args: Array<String>) {
    val list = listOf('a', 'b', 'c')
    val max = list.maxOf { it.toInt() }
    println("Maximum value: \$max")
}

Output

Maximum value: 99

3 Example

In this example,

  • We create a list of strings named list containing elements "apple", "banana", "cherry".
  • We use the maxOf() function with a selector function that returns the length of each string.
  • The maximum value in the list, max, is printed to standard output using println statement.

Kotlin Program

fun main(args: Array<String>) {
    val list = listOf("apple", "banana", "cherry")
    val max = list.maxOf { it.length }
    println("Maximum value: \$max")
}

Output

Maximum value: 6

Summary

In this Kotlin tutorial, we learned about maxOf() extension function of List: the syntax and few working examples with output and detailed explanation for each example.