Convert HashMap to List in Kotlin

In Kotlin, HashMap has 2 properties, keys & values each of these properties will return a list. See below example to return keys as list and values as list

import java.util.HashMap

fun main(array: Array<String>) {

    var map = HashMap<Int, String>();

    map.put(10, "Ten")
    map.put(20, "Twenty")
    map.put(30, "Thirty")
    map.put(40, "Fourty")
    map.put(50, "Fifty")

    var keysList = ArrayList(map.keys);
    var valuesList = ArrayList(map.values);

    println("Keys list : $keysList")
    println("Values list : $valuesList")

}

Output

Keys list : [50, 20, 40, 10, 30]
Values list : [Fifty, Twenty, Fourty, Ten, Thirty]

Conclusion

In this page (written and validated by A. Gawali) you learned about Convert HashMap to List in Kotlin . What's Next? If you are interested in completing Kotlin tutorial, we encourage you simply to start here: Kotlin Tutorial.

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