您如何称呼Kotlin删除JavaScript？

Question

I am working with a third party library from Kotlin and one of the things I must do is call delete thing[key] in order to remove an item from thing. I am unable to figure out how to do this from Kotlin code.

I did try js("delete thing[key]") , but thing is a parameter to a function and is name-mangled by the Kotlin > JavaScript compiler so an exception is thrown when the line is executed. I also tried js("delete ") thing[key] but unsurprisingly that didn't work either.

Answer 1

For delete operator You can write:

external fun delete(p: dynamic): Boolean = noImpl
//...
delete(thing[key])

For more convenient use I'd added some helpers:

fun delete(thing: dynamic, key: String) {
  delete(thing[key])
}

// or
fun String.deleteFrom(d: dynamic) {
  delete(d[this])
}

fun test(a: Any, k: String) {
    delete(a, k)
    k.deleteFrom(a)
    k deleteFrom a
}

Note: using the delete operator is not a good practice and it'll leads to deoptimizations in JS VMs