Publishes a single Boolean value that indicates whether all received elements pass a given error-throwing predicate.
- iOS 13.0+Beta
- macOS 10.15+Beta
- Mac Catalyst 13.0+Beta
- tvOS 13.0+Beta
- watchOS 6.0+Beta
- Xcode 11.0+Beta
A closure that evaluates each received element. Return
trueto continue, or
falseto cancel the upstream and complete. The closure may throw, in which case the publisher cancels the upstream publisher and fails with the thrown error.
A publisher that publishes a Boolean value that indicates whether all received elements pass a given predicate.
When this publisher receives an element, it runs the predicate against the element. If the predicate returns
false, the publisher produces a
false value and finishes. If the upstream publisher finishes normally, this publisher produces a
true value and finishes. If the predicate throws an error, the publisher fails, passing the error to its downstream. As a
reduce-style operator, this publisher produces at most one value. Backpressure note: Upon receiving any request greater than zero, this publisher requests unlimited elements from the upstream publisher.