mirror of
https://github.com/LadybirdBrowser/ladybird
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879ac36e45
Cache the flattened enumerable key snapshot for each `for..in` site and reuse a `PropertyNameIterator` when the receiver shape, dictionary generation, indexed storage kind and length, prototype chain validity, and magical-length state still match. Handle packed indexed receivers as well as plain named-property objects. Teach `ObjectPropertyIteratorNext` in `asmint.asm` to return cached property values directly and to fall back to the slow iterator logic when any guard fails. Treat arrays' hidden non-enumerable `length` property as a visited name for for-in shadowing, and include the receiver's magical-length state in the cache key so arrays and plain objects do not share snapshots. Add `test-js` and `test-js-bytecode` coverage for mixed numeric and named keys, packed receiver transitions, re-entry, iterator reuse, GC retention, array length shadowing, and same-site cache reuse.
9 lines
169 B
JavaScript
9 lines
169 B
JavaScript
function collect(object) {
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const keys = [];
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for (const key in object)
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keys.push(key);
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return keys;
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}
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collect({ 2: "two", foo: "foo", 7: "seven" });
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