Instance Method

tryContains(where:)

Publishes a Boolean value upon receiving an element that satisfies the throwing predicate closure.

Declaration

func tryContains(where predicate: @escaping ((A.Output, B.Output, C.Output)) throws -> Bool) -> Publishers.TryContainsWhere<Publishers.Zip3<A, B, C>>

Parameters

predicate

A closure that takes an element as its parameter and returns a Boolean value indicating whether the element satisfies the closure’s comparison logic.

Return Value

A publisher that emits the Boolean value true when the upstream publisher emits a matching value.

Discussion

This operator consumes elements produced from the upstream publisher until the upstream publisher produces a matching element. If the closure throws, the stream fails with an error.