28 lines
No EOL
967 B
JavaScript
28 lines
No EOL
967 B
JavaScript
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
|