mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-02 08:35:07 +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.
26 lines
763 B
TypeScript
26 lines
763 B
TypeScript
const xs: number[] = [];
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xs[3] = 7;
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xs[4_000_000_000] = 11;
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xs[-1] = 21;
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xs[0.5] = 22;
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console.log("growth", xs.length, xs[3], xs[4_000_000_000]);
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console.log("properties", xs[-1], xs[0.5]);
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const slice = xs.slice(4_000_000_000, 4_000_000_001);
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console.log("slice", slice.length, slice[0]);
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const small: number[] = [];
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small[3] = 7;
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let forEachCalls = 0;
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small.forEach(() => { forEachCalls++; });
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const mapped = small.map((value) => value + 1);
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console.log("hof", forEachCalls, mapped.length, mapped[3]);
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const merged = ([] as number[]).concat(small);
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console.log("concat", merged.length, merged[3]);
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const reversed = small.toReversed();
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console.log("reversed", reversed.length, reversed[0]);
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xs.length = 4;
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console.log("truncate", xs.length, xs[3], xs[-1]);
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