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var ArrayProto = Array.prototype;
var obj = [10, 20, 30];
var px = new Proxy({}, {
ownKeys() {
// snapshot() has already collected "0","1","2" from obj's dense elements.
obj.length = 0;
Object.setPrototypeOf(obj, ArrayProto);
return [];
},
getPrototypeOf() { return null; },
getOwnPropertyDescriptor() { return undefined; }
});
Object.setPrototypeOf(obj, px);
for (var k in obj) {
obj[0] = 99; obj[1] = 99; obj[2] = 99;
Array.prototype.reverse.call(obj);
}