How to Convert a Map to an Array of Values in Kotlin

How to Convert a Map to an Array of Values in Kotlin ?

Answer

To convert a map to an array of values in Kotlin, you can use the values property to get a collection of values and then convert this collection to a list. This provides a convenient way to extract all values from the map.

✐ Examples

1 Converting a Map to an Array of Values Using values Property

We can convert a map to an array of values in Kotlin using the values property, which provides a collection of all values in the map. We can then convert this collection to a list.

For example,

We start by declaring and initializing a map named myMap with some key-value pairs. In this example, the map has string keys and integer values.
We use the values property to get a collection of the values in the map.
We convert the collection of values to a list using the toList method.
We store the list of values in a variable named valuesList.
We print the list of values to the console using the println function to verify the conversion.

Kotlin Program

fun main() {
    // Declare and initialize a map
    val myMap = mapOf(
        "one" to 1,
        "two" to 2,
        "three" to 3
    )

    // Convert map to an array of values
    val valuesList = myMap.values.toList()

    // Print the values
    println("Values: $valuesList")
}

Output

Values: [1, 2, 3]

2 Converting an Empty Map to an Array of Values

We can also convert an empty map to an array of values in Kotlin using the values property, which returns an empty list when the map is empty.

For example,

We start by declaring an empty map named emptyMap with string keys and integer values.
We use the values property to get a collection of the values in the empty map.
We convert the collection of values to a list using the toList method.
We store the list of values in a variable named emptyValuesList.
We print the list of values to the console using the println function to verify that the list is empty.

Kotlin Program

fun main() {
    // Declare an empty map
    val emptyMap = mapOf<String, Int>()

    // Convert empty map to an array of values
    val emptyValuesList = emptyMap.values.toList()

    // Print the values
    println("Values: $emptyValuesList")
}

Output

Values: []

3 Converting a Map to an Array of Values After Adding Elements

We can convert a map to an array of values in Kotlin after adding elements using the values property, which provides an updated collection of all values in the map.

For example,

We start by declaring an empty mutable map named dynamicMap with string keys and integer values.
We add some key-value pairs to the map using the map's index notation.
We use the values property to get a collection of the values in the map after adding elements.
We convert the collection of values to a list using the toList method.
We store the list of values in a variable named dynamicValuesList.
We print the list of values to the console using the println function to verify the updated list of values.

Kotlin Program

fun main() {
    // Declare an empty mutable map
    val dynamicMap = mutableMapOf<String, Int>()

    // Add elements to the map
    dynamicMap["one"] = 1
    dynamicMap["two"] = 2
    dynamicMap["three"] = 3

    // Convert map to an array of values after adding elements
    val dynamicValuesList = dynamicMap.values.toList()

    // Print the values
    println("Values: $dynamicValuesList")
}

Output

Values: [1, 2, 3]

Summary

In this tutorial, we learned How to Convert a Map to an Array of Values in Kotlin language with well detailed examples.

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