next

    Produces the next element in the compact map sequence.

    iOS
    13.0+
    macOS
    10.15+
    tvOS
    13.0+
    watchOS
    6.0+
    mutating func next() async throws -> ElementOfResult?

    This iterator calls next() on its base iterator; if this call returns nil, next() returns nil. Otherwise, next() calls the transforming closure on the received element, returning it if the transform returns a non-nil value. If the transform returns nil, this method continues to wait for further elements until it gets one that transforms to a non-nil value. If calling the closure throws an error, the sequence ends and next() rethrows the error.

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