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toggle.ts
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toggle.ts
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/**
* @license Use of this source code is governed by an MIT-style license that
* can be found in the LICENSE file at https://github.com/cartant/rxjs-etc
*/
import { Observable } from "rxjs";
import { filter, map, share } from "rxjs/operators";
export function toggle<T>(
source: Observable<T>
): [Observable<T>, Observable<T>];
export function toggle<T>(
source: Observable<T>,
states: 2
): [Observable<T>, Observable<T>];
export function toggle<T>(
source: Observable<T>,
states: 3
): [Observable<T>, Observable<T>, Observable<T>];
export function toggle<T>(
source: Observable<T>,
states: number
): Observable<T>[];
export function toggle<T>(
source: Observable<T>,
states: number = 2
): Observable<T>[] {
const result: Observable<T>[] = [];
const indexed = source.pipe(
map((value, index) => [index, value] as [number, T]),
share()
);
for (let state = 0; state < states; ++state) {
result.push(
indexed.pipe(
filter(([index]) => index % states === state),
map(([, value]) => value)
)
);
}
return result;
}