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