Hello, I want to know, which data structure should...

# multiplatform

[juh juh]

Hello, I want to know, which data structure should I use in JS target so it will get compiled into a native JS array without extra overhead?
Mainly, I need access to `push`/`pop` and other js-exclusive array methods

[Jeff Lockhart]

kotlin.Array is mapped to JavaScript Array.

[jw]

I usually just write an external interface for a MutableJsArray and then init with js("[]")

[juh juh]

@jw Thanks you very much! I never knew you can directly run js code, I will go with interface approach too then

[Grégory Lureau]

Why using an external interface instead of just kotlin.Array?

[juh juh]

Because I can't push/pop with it

[Grégory Lureau]

Sorry, I wasn't clear, I was thinking about an extension function on Array that was calling js("this.pop()") for example, but not sure it works.

[juh juh]

Hmm, I will try

[juh juh]

Nah, this does not work

fun <T> Array<T>.push(item: T) {
    js("this.push(item)")
}

gets compiled into

function push(_this__u8e3s4, item) {
    this.push(item);
  }

[jw]

Do val array = this and then array.push inside the JS string