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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
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