[reposted] What is the recommended way to use JS a...

# javascript

[Dmitry Kandalov]

[reposted] What is the recommended way to use JS array from Kotlin to push()/pop() items?
This seems like a basic thing for JS interop but I did't find any obvious solutions (kotlin.Array doesn't have push()/pop() methods).
The most reasonable solution I found was to define external JsArray class:

@JsName("Array")
external class JsArray<T> {
    val length: Int
    fun push(item: T)
    fun pop(): T
    operator fun get(index: Int): T
    operator fun set(index: Int, value: T)
}

(If this is the right thing to do, shouldn't it be in kotlinjs stdlib and mentioned somewhere in docs? 🤔)

[konsoletyper]

Things are a bit simpler.

inline fun <T> Array<T>.push(e: T): Int = asDynamic().push(e)

[snrostov]

I guess this is not in stdlib because size of kotlin.Array is fixed in java.

[Dmitry Kandalov]

@konsoletyper thank you 👍 should be in stdlib and in docs

[natpryce]

Is an ArrayList<T> implemented as an array on the JS platform?

[konsoletyper]

No, ArrayList<T> is not JS array, but it includes JS array as a private property, and its 'add` methods just calls push on that array