| 1 | import { throwIfAborted } from '../aborterror';
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| 2 | import { wrapWithAbort } from './operators/withabort';
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| 3 | export async function extremaBy(source, selector, comparer, signal) {
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| 4 | throwIfAborted(signal);
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| 5 | let result = [];
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| 6 | const it = wrapWithAbort(source, signal)[Symbol.asyncIterator]();
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| 7 | const { value, done } = await it.next();
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| 8 | if (done) {
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| 9 | throw new Error('Sequence contains no elements');
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| 10 | }
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| 11 | let resKey = await selector(value, signal);
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| 12 | result.push(value);
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| 13 | let next;
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| 14 | while (!(next = await it.next()).done) {
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| 15 | const current = next.value;
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| 16 | const key = await selector(current, signal);
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| 17 | const cmp = await comparer(key, resKey, signal);
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| 18 | if (cmp === 0) {
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| 19 | result.push(current);
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| 20 | }
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| 21 | else if (cmp > 0) {
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| 22 | result = [current];
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| 23 | resKey = key;
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| 24 | }
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| 25 | }
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| 26 | return result;
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| 27 | }
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| 28 |
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| 29 |
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