Most efficient way to get/set Array values through C API?

[andrjohns]

(Apologies if a GH issue is the wrong venue for a question like this!)

Currently when using the C API to initialise an Array of scalar values, I have to create a new JSValue for each element and then assign it to the array:

  double val[5] = {1, 2, 3, 4, 5};

  JSValue js_array = JS_NewArray(ctx);
  for (int i = 0; i < 5; i++) {
    JS_SetPropertyUint32(ctx, js_array, i, JS_NewNumber(ctx, val[i]));
  }

In situations like this where I have a contiguous block of values in memory, is there an API for initialising an Array without having to loop over each element? Is it possible to create a new Array, specify its length, and memcpy the memory over (or similar)?

Thanks!

[saghul]

We don't currently have such an API. Adding an API that pre-allocates the array size would probably be a good addition.

You can't just memcpy stuff into an array though, it holds JSValue objects, so you'd still need to build JS objects and assign them.