I remembered Array.shift
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@ -34,17 +34,13 @@ export async function part2(
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windowSize = 3,
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): Promise<number> {
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let increases = 0;
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// TODO: use a proper FIFO queue data structure for this?
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let window: number[] = await Promise.all(Array.from(
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const window: number[] = await Promise.all(Array.from(
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Array(windowSize),
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async (_x, _i) => parseInt((await input.next()).value),
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));
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for await (const depth of input) {
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if (depth > window[0]) increases++;
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// TODO: if this was a proper queue, we could just push it on the queue and
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// expect the first-in value to fall out
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window = window.slice(1);
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if (depth > (window.shift() as number)) increases++;
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window.push(depth);
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}
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return increases;
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