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When\n * an Observable returned by the operator is subscribed, condition function will be called.\n * Based on what boolean it returns at that moment, consumer will subscribe either to\n * the first Observable (if condition was true) or to the second (if condition was false). Condition\n * function may also not return anything - in that case condition will be evaluated as false and\n * second Observable will be subscribed.\n *\n * Note that Observables for both cases (true and false) are optional. If condition points to an Observable that\n * was left undefined, resulting stream will simply complete immediately. That allows you to, rather\n * then controlling which Observable will be subscribed, decide at runtime if consumer should have access\n * to given Observable or not.\n *\n * If you have more complex logic that requires decision between more than two Observables, {@link defer}\n * will probably be a better choice. Actually `iif` can be easily implemented with {@link defer}\n * and exists only for convenience and readability reasons.\n *\n *\n * ## Examples\n * ### Change at runtime which Observable will be subscribed\n * ```javascript\n * let subscribeToFirst;\n * const firstOrSecond = iif(\n *   () => subscribeToFirst,\n *   of('first'),\n *   of('second'),\n * );\n *\n * subscribeToFirst = true;\n * firstOrSecond.subscribe(value => console.log(value));\n *\n * // Logs:\n * // \"first\"\n *\n * subscribeToFirst = false;\n * firstOrSecond.subscribe(value => console.log(value));\n *\n * // Logs:\n * // \"second\"\n *\n * ```\n *\n * ### Control an access to an Observable\n * ```javascript\n * let accessGranted;\n * const observableIfYouHaveAccess = iif(\n *   () => accessGranted,\n *   of('It seems you have an access...'), // Note that only one Observable is passed to the operator.\n * );\n *\n * accessGranted = true;\n * observableIfYouHaveAccess.subscribe(\n *   value => console.log(value),\n *   err => {},\n *   () => console.log('The end'),\n * );\n *\n * // Logs:\n * // \"It seems you have an access...\"\n * // \"The end\"\n *\n * accessGranted = false;\n * observableIfYouHaveAccess.subscribe(\n *   value => console.log(value),\n *   err => {},\n *   () => console.log('The end'),\n * );\n *\n * // Logs:\n * // \"The end\"\n * ```\n *\n * @see {@link defer}\n *\n * @param {function(): boolean} condition Condition which Observable should be chosen.\n * @param {Observable} [trueObservable] An Observable that will be subscribed if condition is true.\n * @param {Observable} [falseObservable] An Observable that will be subscribed if condition is false.\n * @return {Observable} Either first or second Observable, depending on condition.\n * @static true\n * @name iif\n * @owner Observable\n */\nexport function iif<T, F>(\n  condition: () => boolean,\n  trueResult: SubscribableOrPromise<T> = EMPTY,\n  falseResult: SubscribableOrPromise<F> = EMPTY\n): Observable<T|F> {\n  return defer<T|F>(() => condition() ? trueResult : falseResult);\n}\n"},"lineCount":null}},"hash":"15fd28d3ea6249249364b11ea613fdbf","cacheData":{"env":{}}}