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https://github.com/vercel-labs/scriptc.git
synced 2026-11-06 08:23:19 +08:00
Chris Tate
b3217f0650
In TypeScript, Object.values over a checked-dynamic value whose result is only iterated with for-of, indexed, or passed to every, some, findIndex, forEach, join or reduce now returns a native vector of the checked values. The program never observes the array itself, so the checked-dynamic array and, for for-of, the dynamic iterator protocol are skipped. Typed records fill the vector through their record ops table and plain data objects from their entries in own-key order. Other uses, and JavaScript files, keep the checked-dynamic array.
27 lines
1.5 KiB
TypeScript
27 lines
1.5 KiB
TypeScript
// Read-only array methods and index reads applied directly to
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// Object.values of unknown values: typed records and JSON objects,
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// negative zero, nested containers, out-of-range and fractional indexes,
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// and the empty-array reduce TypeError.
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interface P { a: number; b: string; c: number[]; d?: boolean }
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const p: P = { a: 1, b: "x", c: [2, 3] };
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const u: any = p;
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const j: any = JSON.parse('{"x":1,"y":"two","z":null,"w":-0}');
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for (const v of [u, j]) {
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console.log(Object.values(v).every((x) => x !== undefined), Object.values(v).some((x) => typeof x === "string"));
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console.log(Object.values(v).findIndex((x) => x === null), Object.values(v).findIndex((x) => x === "x"));
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Object.values(v).forEach((x, i) => console.log(i, JSON.stringify(x), Object.is(x, -0)));
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console.log(Object.values(v).join("-"), Object.values(v).join());
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console.log(Object.values(v).reduce((acc: number, x) => acc + (typeof x === "number" ? x : 0), 0));
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console.log(Object.values(v).reduce((acc: unknown, x) => (acc === null ? x : acc)));
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console.log(Object.values(v).find((x) => typeof x === "string"), Object.values(v).includes(1), Object.values(v).indexOf("x"));
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const i = 7;
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console.log(Object.values(v)[0], Object.values(v)[1], Object.values(v)[-1], Object.values(v)[1.5], Object.values(v)[i]);
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}
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console.log(Object.values(u)[2] === p.c, Object.values(u).length);
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try {
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const empty: any = JSON.parse("{}");
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console.log(Object.values(empty).reduce((a: unknown, b) => b));
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} catch (e) {
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console.log(e instanceof TypeError, (e as Error).message);
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}
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