es6/operators/race.js

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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