How to create a List of Dictionaries in Kotlin

How to create a List of Dictionaries in Kotlin ?

Answer

To create a list of dictionaries in Kotlin, you can use the `mutableListOf` function to create an outer list and `mutableMapOf` function to create inner dictionaries, then add dictionaries as elements of the outer list.

✐ Examples

1 Create List of Dictionaries

In this example,

We create two inner dictionaries named dict1 and dict2 using the mutableMapOf function.
We create an outer list named listOfDicts using the mutableListOf function and initialize it with the inner dictionaries.
Finally, we print the list of dictionaries to standard output.

Kotlin Program

fun main() {
    val dict1 = mutableMapOf("key1" to "value1", "key2" to "value2")
    val dict2 = mutableMapOf("key3" to "value3", "key4" to "value4")
    val listOfDicts = mutableListOf(dict1, dict2)
    println(listOfDicts)
}

Output

[{key1=value1, key2=value2}, {key3=value3, key4=value4}]

2 Create List of Dictionaries with Empty Inner Dictionaries

In this example,

We create an empty outer list named listOfDictsEmpty using the mutableListOf function.
We create two empty inner dictionaries named dict3 and dict4 using the mutableMapOf function.
We use the add method to add the inner dictionaries dict3 and dict4 to the outer list listOfDictsEmpty.
Finally, we print the list of dictionaries with empty inner dictionaries to standard output.

Kotlin Program

fun main() {
    val listOfDictsEmpty = mutableListOf<MutableMap<String, String>>()
    val dict3 = mutableMapOf<String, String>()
    val dict4 = mutableMapOf<String, String>()
    listOfDictsEmpty.add(dict3)
    listOfDictsEmpty.add(dict4)
    println(listOfDictsEmpty)
}

Output

[{}, {}]

Summary

In this tutorial, we learned How to create a List of Dictionaries in Kotlin language with well detailed examples.

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How to create a List of Dictionaries in Kotlin

How to create a List of Dictionaries in Kotlin ?

Answer

✐ Examples

1 Create List of Dictionaries

Kotlin Program

Output

2 Create List of Dictionaries with Empty Inner Dictionaries

Kotlin Program

Output

Summary

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