map Include in Kotlin

In Kotlin, we can use the in operator to check if a key is available in a hash. We use the syntax in to check if the is present in the .

Here is an example:

fun main() {
    val myMap = hashMapOf("one" to 1, "two" to 2, "three" to 3)
if ("one" in myMap) {

        println("Key 'one' is present with value ${myMap["one"]}")

    } else {

        println("Key 'one' is not present")

    }
if ("four" in myMap) {

        println("Key 'four' is present with value ${myMap["four"]}")

    } else {

        println("Key 'four' is not present")

    }

}

Output:

Key 'one' is present with value 1

Key 'four' is not present

In the example, we have created a hash map containing three key-value pairs. We then use the in operator to check if "one" and "four" keys are present. The first check for "one" key returns true, and the second check for "four" key returns false.