CODEWITHSUNDEEP
dictionarykotlin
muad-dweeb
muad-dweeb

Reputation: 1155

Unable to modify Kotlin MutableMap

I have created a map with the following:

var names = mutableMapOf<String, Map<String, List<String>>>(
    "test" to mapOf(
        "first" to listOf(
            "Spongebob", "Patrick"
        ),
        "last" to listOf(
            "Squarepants", "Star"
        )
    )
)

Next I would like to modify the map, which I think intuitively would be something like:

names["test"]["first"].add("Squidward")

However, this line is giving me an error: Expecting a top level declaration

I don't understand this; is my MutableMap definition not the declaration?

I'm coming from Python, so I'm expecting to be able to access my dict by keys and edit as necessary.

Upvotes: 0

Views: 245

Answers (2)

muad-dweeb
muad-dweeb

Reputation: 1155

As @PiRocks pointed out in a comment, the issue was that I wasn't wrapping it all in a function.

I ultimately solved the issue by separating out the nested dict structure and creating sub classes with their own "first" and "last" list variables. I think this reduced complexity in my case and it now seems to work great.

Upvotes: 0

Orest Shemeliuk
Orest Shemeliuk

Reputation: 21

You are trying to modify a list which is immutable, try this:

 var names = mutableMapOf<String, MutableMap<String, MutableList<String>>>(
        "test" to mutableMapOf(
            "first" to mutableListOf(
                "Spongebob", "Patrick"
            ),
            "last" to mutableListOf(
                "Squarepants", "Star"
            )
        )
    )

Upvotes: 1

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