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import { identity } from '../util/identity'; import { operate } from '../util/lift'; import { createOperatorSubscriber } from './OperatorSubscriber'; export function skipLast(skipCount) { return skipCount <= 0 ? identity : operate((source, subscriber) => { let ring = new Array(skipCount); let seen = 0; source.subscribe(createOperatorSubscriber(subscriber, (value) => { const valueIndex = seen++; if (valueIndex < skipCount) { ring[valueIndex] = value; } else { const index = valueIndex % skipCount; const oldValue = ring[index]; ring[index] = value; subscriber.next(oldValue); } })); return () => { ring = null; }; }); } //# sourceMappingURL=skipLast.js.map