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Malte UblandClaude Opus 5.5
e6dbad9567
`const [[k, v], ...rest] = map` was refused (SC1031). The source now snapshots once into its iteration order (Map entries as pairs, Set values), the spread's own machinery, and the pattern lowers as an array pattern over that snapshot, as string sources already do. Element defaults keep a fence because they run between iterator steps. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
19 lines
681 B
TypeScript
19 lines
681 B
TypeScript
// Array destructuring of a Map or Set walks its iterator: Map entries as
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// [key, value] pairs, Set values, holes and rest included.
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const m = new Map([["a", "1"], ["b", "2"], ["c", "3"]]);
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const [[name, value], ...rest] = m;
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console.log(name, value, rest.length, JSON.stringify(rest));
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const [first, , third] = m;
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console.log(JSON.stringify(first), JSON.stringify(third));
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const s = new Set([3, 1, 2]);
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const [x, y, ...others] = s;
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console.log(x, y, others);
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let [p] = new Map<string, number>([["only", 1]]);
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p = ["changed", 2];
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console.log(p);
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function firstKey(map: Map<string, number>): string {
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const [[k]] = map;
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return k;
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}
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console.log(firstKey(new Map([["z", 26]])));
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