Even with Java code, you shouldn't be declaring any variables as ArrayList or HashMap. As Stephan has already mentioned, avoid using specific implementations like HashMap and ArrayList. It seems to you have previously programmed in Java and have carried over some poor habits from working in Java.Ģ. Again, making Product immutable will require a shift in the way you're thinking about your program objects. You might also be able to keep your Product data class immutable as well:ĭata class Product(val name: String, val availableQuantity: Int)Īlthough I'd have to see more details of how you're using it. This leads to non-functional code: var data: Map> That being said, I think I have a pretty decent handle on some of the Kotlin idioms. The following example demonstrates how you can create a dynamic array list and initialize the same.If you don't mind, a few comments on style.Ĭaveat: I've just recently started out with Kotlin myself so there may be better and more idiomatic ways than what I'm about to suggest below. Example: Initialize an empty array in Kotlin If a number is provided as the argument, then it will return an arrayList with the given elements. The function definition of arrayList goes like this − fun arrayListOf(): ArrayList An ArrayList is an ordered sequence of elements, however, unlike simple arrays, an ArrayList can contain data of multiple data types. It would be a dynamic array which means it will automatically expand as we add data into it. Kotlin ArrayList class can be used in order to create an empty arrayList.
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