mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-28 06:53:42 +08:00
Chris Tate
0ba86b289a
- Speed up string-keyed collections and wide object property lookup. - Share scalable numeric-key ordering across typed and checked objects. - Preserve property, iteration, and ownership behavior across native and WASI targets.
31 lines
1.7 KiB
JavaScript
31 lines
1.7 KiB
JavaScript
// Wide checked objects preserve insertion order, descriptor behavior, and
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// lookups when entries move after deletion or are replaced by accessors.
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const object = JSON.parse("{}");
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for (let i = 95; i >= 0; i--) object[String(i)] = i * 3;
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for (const key of ["tail", "01", "4294967295", "4294967294", "-0", "", "a\0b", "é😀"]) object[key] = key;
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console.log(Object.keys(object).join("|"));
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console.log(Object.values(object).join("|"));
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for (let i = 0; i < 96; i += 3) delete object[String(i)];
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for (let i = 0; i < 96; i += 3) object[String(i)] = -i;
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object.tail = "updated";
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Object.defineProperty(object, "hidden", { value: 42, enumerable: false, configurable: true });
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Object.defineProperty(object, "31", { get() { delete object["32"]; object.added = 123; return "getter"; }, enumerable: true, configurable: true });
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console.log(Object.entries(object).map(([key, value]) => key + ":" + value).join("|"));
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console.log(Reflect.ownKeys(object).join("|"));
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console.log(object.hidden, object.missing, object["a\0b"], object["é😀"]);
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for (let i = 0; i < 96; i++) delete object[String(i)];
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console.log(Object.keys(object).join("|"));
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for (let i = 0; i < 100; i++) object["key-" + i] = i;
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Object.freeze(object);
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try { object["key-50"] = 0; } catch (error) { console.log(error.name); }
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console.log(object["key-50"], Object.keys(object).length);
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const duplicates = JSON.parse('{"32":1,"1":2,"32":3,"x":4,"x":5}');
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console.log(JSON.stringify(duplicates));
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// Recycling and cyclic destruction must discard all index storage.
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for (let round = 0; round < 40; round++) {
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const cycle = JSON.parse("{}");
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for (let i = 0; i < 80; i++) cycle["property-" + i] = round + i;
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cycle.self = cycle;
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console.log(cycle["property-79"], Object.keys(cycle).length);
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}
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