15 lines
494 B
JavaScript
15 lines
494 B
JavaScript
import { operate } from '../util/lift';
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import { createOperatorSubscriber } from './OperatorSubscriber';
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export function pairwise() {
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return operate((source, subscriber) => {
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let prev;
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let hasPrev = false;
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source.subscribe(createOperatorSubscriber(subscriber, (value) => {
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const p = prev;
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prev = value;
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hasPrev && subscriber.next([p, value]);
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hasPrev = true;
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}));
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});
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}
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//# sourceMappingURL=pairwise.js.map
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