TeeObserver

Note: must not throw!

Note: must not throw!

Note: must not throw!

Like contramap but with collect semantics: not calling the original observer when pf is not defined

Creates another Observer such that calling its onNext will call this observer's onNext with the value processed by the project function.

This is useful when you need to pass down an Observer[A] to a child component which should not know anything about the type A, but both child and parent know about type B, and the parent knows how to translate B into A.

Like contramap, but original observer only fires if project returns Some(value)

So, similar to contracollect but optimized for APIs like NonEmptyList.fromList that return an Option.

Available only on Observers of Option, this is a shortcut for contramapB

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

Creates another Observer such that calling it calls the original observer after the specified delay.

Creates another Observer such that calling its onNext will call this observer's onNext with the same value, but only if it passes the test.

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

Override defaultDisplayName instead of this, if you need to.