CustomStreamSource

Subscribe an external observer to this observable

Apply pf to event and emit the resulting value, or emit nothing if pf is not defined for that event.

Apply fn to parent stream event, and emit resulting x if it returns Some(x)

Emit x if parent stream emits Some(x), nothing otherwise

See docs for DebounceStream

See also debug convenience method in BaseObservable

This is the method that subclasses override to preserve the user's ability to set custom display names.

Make a stream that emits this stream's values but waits for after stream to emit first in a given transaction. You can use this for Signals too with Signal.composeChanges (see docs for more details)

Distinct events (but keep all errors) by == (equals) comparison

Distinct events (but keep all errors) using a comparison function

Distinct events (but keep all errors) by matching key Note: key(event) might be evaluated more than once for each event

Distinct events (but keep all errors) by reference equality (eq)

Distinct errors only (but keep all events) using a comparison function

Distinct all values (both events and errors) using a comparison function

Drop (skip) the first numEvents events from this stream. Note: errors are NOT dropped.

Drop (skip) events from this stream as long as they do NOT pass the test (as soon as they start passing, stop dropping) Note: errors are NOT dropped.

Drop (skip) events from this stream as long as they pass the test (as soon as they stop passing, stop dropping) Note: errors are NOT dropped.

Airstream may internally use Scala library functions which use == or hashCode for equality, for example List.contains. Comparing observables by structural equality pretty much never makes sense, yet it's not that hard to run into that, all you need is to create a case class subclass, and the Scala compiler will generate a structural-equality equals and hashCode methods for you behind the scenes.

To prevent that, we make equals and hashCode methods final, using the default implementation (which is reference equality).

stream.filterWith(otherSignal, passes = _ == false) is essentially like stream.filter(_ => otherSignal.now() == false) (but it compiles)

Create an external observer from a function and subscribe it to this observable.

Note: since you won't have a reference to the observer, you will need to call Subscription.kill() to unsubscribe

Force reference equality checks. See comment for equals.

value is passed by name, so it will be evaluated whenever the Observable fires. Use it to sample mutable values (e.g. myInput.ref.value in Laminar).

See also: mapToStrict

value is evaluated strictly, only once, when this method is called.

See also: mapTo

Returns a stream that emits events from this stream AND all off the streams, interleaved. Note: For other types of combination, see combineWith, withCurrentValueOf, sample etc.

Total number of internal and external observers

See docs for MapStream

Convert this to an observable that emits Failure(err) instead of erroring

A signal that emits the accumulated value every time that the parent stream emits.

A signal that emits the accumulated value every time that the parent stream emits.

Set the display name for this instance (observable or observer).

• This method modifies the instance and returns this. It does not create a new instance.
• New name you set will override the previous name, if any. This might change in the future. For the sake of sanity, don't call this more than once for the same instance.
• If display name is set, toString will output it instead of the standard type@hashcode string

Take the first numEvents events from this stream, ignore the rest. Note: As long as events are being taken, ALL errors are also taken

Imitate parent stream as long as events to NOT pass the test; stop emitting after that.

Imitate parent stream as long as events pass the test; stop emitting after that.

See docs for ThrottleStream

Unwrap Try to "undo" recoverToTry – Encode Failure(err) as observable errors, and Success(v) as events

Override defaultDisplayName instead of this, if you need to.

Convert this observable to a signal of Option[A]. If it is a stream, set initial value to None.

Note: Observer can be added more than once to an Observable. If so, it will observe each event as many times as it was added.

Note: This is enforced to be a Set outside of the type system #performance