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https://github.com/vercel-labs/scriptc.git
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Chris Tate
bf21f47827
- Preserve async factory results and mixed table layouts through inference and destructuring. - Support checked Map and Object.fromEntries construction with native weak collections. - Keep native weak-key lifetimes and engine-backed collection identities intact.
25 lines
1.1 KiB
JavaScript
25 lines
1.1 KiB
JavaScript
const key = JSON.parse('{}');
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const other = JSON.parse('{}');
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const set = new WeakSet();
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console.log(set.add(key) === set, set.has(key), set.has(other));
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console.log(set.delete(key), set.delete(key), set.has(key));
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const bytes = new Uint16Array(4);
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const buffer = bytes.buffer;
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const collection = new WeakMap();
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const keys = [key, JSON.parse('[]'), bytes, buffer, collection, set];
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const seeded = new WeakSet(keys);
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for (const item of keys) console.log(seeded.has(item));
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console.log(seeded.has(bytes.subarray(1).buffer), seeded.has(bytes.subarray(1)));
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function from(items) { return new WeakSet(items); }
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console.log(from(null).has(key), from(undefined).has(key));
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for (const item of [null, undefined, false, 1, "key"]) {
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console.log(set.has(item), set.delete(item));
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try { set.add(item); } catch (error) { console.log(error.name, error.message); }
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}
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for (const item of [[null], [1], "x", 7]) {
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try { from(item); } catch (error) { console.log(error.name, error.message); }
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}
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console.log(set.size === undefined);
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console.log(set instanceof WeakSet, set instanceof WeakMap, Object.prototype.toString.call(set));
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