work.suroh.tk/node_modules/rxjs/_esm2015/operators/race.js

22 lines
964 B
JavaScript

import { isArray } from '../util/isArray';
import { race as raceStatic } from '../observable/race';
/* tslint:enable:max-line-length */
/**
* Returns an Observable that mirrors the first source Observable to emit an item
* from the combination of this Observable and supplied Observables.
* @param {...Observables} ...observables Sources used to race for which Observable emits first.
* @return {Observable} An Observable that mirrors the output of the first Observable to emit an item.
* @method race
* @owner Observable
*/
export function race(...observables) {
return function raceOperatorFunction(source) {
// if the only argument is an array, it was most likely called with
// `pair([obs1, obs2, ...])`
if (observables.length === 1 && isArray(observables[0])) {
observables = observables[0];
}
return source.lift.call(raceStatic(source, ...observables));
};
}
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