Source code
Revision control
Copy as Markdown
Other Tools
let Array_unscopables = Array.prototype[Symbol.unscopables];
let desc = Reflect.getOwnPropertyDescriptor(Array.prototype, Symbol.unscopables);
assertDeepEq(desc, {
value: Array_unscopables,
writable: false,
enumerable: false,
configurable: true
});
assertEq(Reflect.getPrototypeOf(Array_unscopables), null);
let desc2 = Object.getOwnPropertyDescriptor(Array_unscopables, "values");
assertDeepEq(desc2, {
value: true,
writable: true,
enumerable: true,
configurable: true
});
let keys = Reflect.ownKeys(Array_unscopables);
// the keys are in alphabetical order
let expectedKeys = ["at",
"copyWithin",
"entries",
"fill",
"find",
"findIndex",
"findLast",
"findLastIndex",
"flat",
"flatMap",
"includes",
"keys",
"toReversed",
"toSorted",
"toSpliced",
"values"];
assertDeepEq(keys, expectedKeys);
for (let key of keys)
assertEq(Array_unscopables[key], true);
// Test that it actually works
assertThrowsInstanceOf(() => {
with ([]) {
return entries;
}
}, ReferenceError);
{
let fill = 33;
with (Array.prototype) {
assertEq(fill, 33);
}
}
reportCompare(0, 0);