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/**
* Determines whether an observable collection contains values. There is an alias for this method called 'ifThen' for browsers <IE9
*
* @example
* 1 - res = Rx.Observable.if(condition, obs1);
* 2 - res = Rx.Observable.if(condition, obs1, obs2);
* 3 - res = Rx.Observable.if(condition, obs1, scheduler);
* @param {Function} condition The condition which determines if the thenSource or elseSource will be run.
* @param {Observable} thenSource The observable sequence or Promise that will be run if the condition function returns true.
* @param {Observable} [elseSource] The observable sequence or Promise that will be run if the condition function returns false. If this is not provided, it defaults to Rx.Observabe.Empty with the specified scheduler.
* @returns {Observable} An observable sequence which is either the thenSource or elseSource.
*/
Observable['if'] = Observable.ifThen = function (condition, thenSource, elseSourceOrScheduler) {
return observableDefer(function () {
elseSourceOrScheduler || (elseSourceOrScheduler = observableEmpty());
isPromise(thenSource) && (thenSource = observableFromPromise(thenSource));
isPromise(elseSourceOrScheduler) && (elseSourceOrScheduler = observableFromPromise(elseSourceOrScheduler));
// Assume a scheduler for empty only
typeof elseSourceOrScheduler.now === 'function' && (elseSourceOrScheduler = observableEmpty(elseSourceOrScheduler));
return condition() ? thenSource : elseSourceOrScheduler;
});
};
Version data entries
14 entries across 7 versions & 1 rubygems