CODEWITHSUNDEEP
typescriptkotlin
Mr. Robot
Mr. Robot

Reputation: 1824

How to assign values to a map for later use in Kotlin class?

I want to create a map of key value pairs in Kotlin inside a class that can be arbitrarily updated and referenced. I have read that a MutableMap may be what I need since I can update is at any time. In Typescript my code would look like the following. How can I write something similar in Kotlin?

type Callback = (id: string) => void | null;

interface DataMap {
  streetNumber: number | null;
  streetName: string | null;
  callback: Callback | null;
}

const dataMap: DataMap = {
  streetNumber: null,
  streetName: null,
  callback: null,
}

// do something later..
const doSomething = (streetName: string, callback: Callback): void => {
  dataMap.streetName = streetName;
  dataMap.callback = callback;
}

// and then..
const printData = (): void => {
  console.log(dataMap.streetName) // streetName is printed
}

Upvotes: 0

Views: 236

Answers (1)

Joffrey
Joffrey

Reputation: 37710

You only need a map if the keys themselves are dynamic (the names of the properties). If in TS you have an interface with specific property names, you can do the same in Kotlin.

A somewhat equivalent code in Kotlin could be:

typealias Callback = (id: String) -> Unit?

data class DataMap(
    var streetNumber: Int?,
    var streetName: String?,
    var callback: Callback?,
)

val dataMap = DataMap(
    streetNumber = null,
    streetName = null,
    callback = null,
)

// do something later..
fun doSomething(streetName: String, callback: Callback) {
    dataMap.streetName = streetName
    dataMap.callback = callback
}

// and then..
fun printData() {
    println(dataMap.streetName) // streetName is printed
}

Although we would usually avoid global variables.

Upvotes: 2

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