Kotlin HashMap mapKeys()
Syntax & Examples

Syntax of HashMap.mapKeys()

The syntax of HashMap.mapKeys() extension function is:

fun <K, V, R> Map<out K, V>.mapKeys( transform: (Entry<K, V>) -> R ): Map<R, V>

This mapKeys() extension function of HashMap returns a new Map with entries having the keys obtained by applying the transform function to each entry in this Map and the values of this map.