Kotlin Tutorials

Kotlin Map minWith()
Syntax & Examples

Syntax of Map.minWith()

There are 2 variations for the syntax of Map.minWith() extension function. They are:

1.
fun <K, V> Map<out K, V>.minWith( comparator: Comparator<in Entry<K, V>> ): Entry<K, V>

This extension function returns the first entry having the smallest value according to the provided comparator.

2.
fun <K, V> Map<out K, V>.minWith( comparator: Comparator<in Entry<K, V>> ): Entry<K, V>?

This extension function


✐ Examples

1 Get entry with minimum character value in the map

In this example,

  • We create a map named map1 containing integer keys and character values.
  • We then apply the minWith() function on map1, using a custom comparator to compare values.
  • As a result, the entry with the minimum character value in map1 is returned.
  • We print the result to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val map1 = mapOf(1 to 'a', 2 to 'b', 3 to 'c')
    val result = map1.minWith(Comparator { entry1, entry2 -> entry1.value.compareTo(entry2.value) })
    println(result)
}

Output

1=a

2 Get entry with minimum integer value in the map

In this example,

  • We create a map named map2 containing character keys and integer values.
  • We then apply the minWith() function on map2, using a custom comparator to compare values.
  • As a result, the entry with the minimum integer value in map2 is returned.
  • We print the result to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val map2 = mapOf('a' to 1, 'b' to 2, 'c' to 3)
    val result = map2.minWith(Comparator { entry1, entry2 -> entry1.value.compareTo(entry2.value) })
    println(result)
}

Output

a=1

Summary

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