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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.
36 lines
1.2 KiB
JavaScript
36 lines
1.2 KiB
JavaScript
function makeMap(entries) { return new Map(entries); }
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const value = { count: 3 };
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const objectKey = {};
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const entries = JSON.parse('[["a",0],["key",4],[0,5],["a",0],[0,6]]');
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entries[0][1] = value;
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entries[1][0] = objectKey;
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entries[2][0] = NaN;
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entries[3][1] = value;
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entries[4][0] = NaN;
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const map = makeMap(entries);
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console.log(map.size, map.get("a") === value, map.get(objectKey), map.get(NaN));
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console.log(makeMap(null).size, makeMap(undefined).size, makeMap("").size);
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console.log(makeMap([["missing"], []]).has(undefined));
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console.log(makeMap([["missing"], []]).get("missing") === undefined);
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const live = [];
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const pair = {};
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let reads = 0;
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Object.defineProperty(pair, "0", { get() {
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reads++;
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live.push(["second", 2]);
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return "first";
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} });
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Object.defineProperty(pair, "1", { get() {
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reads++;
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return 1;
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} });
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live.push(pair);
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const grown = makeMap(live);
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console.log(reads, grown.size, grown.get("first"), grown.get("second"));
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/** @type {any[]} */
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const invalidCases = [[1], [null], [undefined], [false], ["abc"], "abc", 7, {}];
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for (const invalid of invalidCases) {
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try { makeMap(invalid); } catch (error) { console.log(error.name, error.message); }
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}
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