d2-ui
Version:
24 lines (21 loc) • 855 B
text/typescript
/// <reference path="../../observable.ts" />
module Rx {
export interface Observable<T> {
/**
* Returns the elements of the specified sequence or the specified value in a singleton sequence if the sequence is empty.
*
* var res = obs = xs.defaultIfEmpty();
* 2 - obs = xs.defaultIfEmpty(false);
*
* @memberOf Observable#
* @param defaultValue The value to return if the sequence is empty. If not provided, this defaults to null.
* @returns {Observable} An observable sequence that contains the specified default value if the source is empty; otherwise, the elements of the source itself.
*/
defaultIfEmpty(defaultValue?: T): Observable<T>;
}
}
(function () {
var o: Rx.Observable<string>;
o.defaultIfEmpty();
o.defaultIfEmpty('default');
});