mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-19 05:29:46 +08:00
Chris Tate
94fd361b54
Represent ordinary JavaScript arrays with hole, value, and explicit-undefined states; add sparse side storage and carry missing values through the frontend, native backends, runtime, and Node-facing consumers.
22 lines
887 B
TypeScript
22 lines
887 B
TypeScript
// Missing array reads are legal search needles. indexOf skips holes, while
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// includes observes a hole as undefined; explicit undefined remains present
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// and searchable in both methods.
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const numbers: number[] = [];
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numbers[1] = 0 / 0;
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numbers[3] = -0;
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console.log(numbers.indexOf(numbers[0]), numbers.includes(numbers[0]));
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console.log(numbers.indexOf(0 / 0), numbers.includes(0 / 0));
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console.log(numbers.indexOf(0), numbers.indexOf(-0), numbers.includes(0));
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const optional: (number | undefined)[] = [];
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optional[0] = undefined;
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optional[2] = 4;
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console.log(optional.indexOf(optional[0]), optional.includes(optional[0]));
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console.log(optional.indexOf(optional[1]), optional.includes(optional[1]));
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const kv: [string, string][] = [["host", "localhost"], ["port", "8080"]];
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console.log(kv.indexOf(kv[1]), kv.includes(kv[1]));
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console.log(kv.indexOf(kv[99]), kv.includes(kv[99]));
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