FirstOperator<T> extension

Methods

findFirst(Predicate1<T> predicate) → Observable<T>

Emits the first item of this Observable sequence matching the predicate, or emits an TooFewError otherwise.

findFirstOrDefault(Predicate1<T> predicate, T value) → Observable<T>

Emits the first item of this Observable sequence matching the predicate, or the provided default value otherwise.

findFirstOrElse(Predicate1<T> predicate, Map0<T> callback) → Observable<T>

Emits the first item of this Observable sequence matching the predicate, or evaluate the provided callback otherwise.

first() → Observable<T>

Emits the first item of this Observable, or emits an TooFewError otherwise.

firstOrDefault(T value) → Observable<T>

Emits the first item of this Observable, or the provided default value otherwise.

firstOrElse(Map0<T> callback) → Observable<T>

Emits the first item of this Observable, or evaluate the provided callback otherwise.