| 1 | import { AsyncIterableX } from './asynciterablex';
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| 2 | export class PairwiseAsyncIterable extends AsyncIterableX {
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| 3 | constructor(source) {
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| 4 | super();
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| 5 | this._source = source;
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| 6 | }
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| 7 | async *[Symbol.asyncIterator]() {
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| 8 | let value, hasValue = false;
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| 9 | for await (const item of this._source) {
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| 10 | if (!hasValue) {
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| 11 | hasValue = true;
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| 12 | }
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| 13 | else {
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| 14 | yield [value, item];
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| 15 | }
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| 16 | value = item;
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| 17 | }
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| 18 | }
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| 19 | }
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| 20 | /**
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| 21 | * Returns a new sequence that triggers on the second and subsequent triggerings of the input sequence.
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| 22 | * @param {AsyncIterable<T>} source Source sequence.
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| 23 | * @return {AsyncIterable<T[]>} A sequence that triggers on successive pairs of iterations from the input sequence.
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| 24 | */
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| 25 | export function pairwise(source) {
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| 26 | return new PairwiseAsyncIterable(source);
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| 27 | }
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| 28 |
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| 29 | //# sourceMappingURL=pairwise.mjs.map
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