Emit an event, calling all observers.
Add a new observer. If an event was emitted before, the observer is called with the last value.
Map all values to a constant.
Only emit values that pass the predicate.
Transform a observable of observables into a observable of values emitted by values of the original observable.
Transform each value by a function.
Combine multiple observables into one.
Accumulate values using a function.
Takes an observable of values, each time the original observable emits, this observable emits the last value emitted by the observable of values.
Wrap each value into an object with the key provided.