| 1 | import { iterateLater } from '.';
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| 2 |
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| 3 | export function partition<T>(
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| 4 | index: number,
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| 5 | iterable: AsyncIterable<T>
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| 6 | ): [AsyncIterable<T>, AsyncIterable<T>] {
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| 7 | let current = 0;
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| 8 | const [partitionFirst, nextFirst, completeFirst] = iterateLater<T>();
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| 9 | const [partitionSecond, nextSecond, completeSecond] = iterateLater<T>();
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| 10 | const iterate = async () => {
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| 11 | for await (const value of iterable) {
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| 12 | if (current == index) {
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| 13 | completeFirst();
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| 14 | }
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| 15 | if (current < index) {
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| 16 | nextFirst(value);
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| 17 | } else {
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| 18 | nextSecond(value);
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| 19 | }
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| 20 | current++;
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| 21 | }
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| 22 | completeFirst();
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| 23 | completeSecond();
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| 24 | };
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| 25 | iterate();
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| 26 | return [partitionFirst, partitionSecond];
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| 27 | }
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