Using ArrayProxy as function parameter do not allow some operations. about graaljs HOT 1 CLOSED

The support for writing the length property of foreign (= non-JavaScript arrays) has been implemented by e3582e2.

Your test-case will throw TypeError still because ProxyArray.fromList(Arrays.asList(1, 2, 3, 4, 5)) does not support the removal of its members (because Arrays.asList(1, 2, 3, 4, 5) does not support remove() operation). On the other hand, the test-case should work (with the mentioned fix) if you use ProxyArray.fromList() with a list that supports remove() (or if you use a custom implementation of ProxyArray that supports removal/addition of elements).

Some JS Array methods, like .push() and .pop(), do not work in this scenario too.

Array.prototype.push and Array.prototype.pop should work fine with a foreign array if the array supports the removal/addition of an element. Note that this is not the case for ProxyArray.fromList() (which does not support the addition of an element).

from graaljs.