Example (Apple Official)
1 2 3 4 5 6 7 | let prefixValues = [0, 1, 255]let dataElements = (0...10)let cancellable = dataElements.publisher .prepend(prefixValues) .sink { print("\($0)", terminator: " ") }//0 1 255 0 1 2 3 4 5 6 7 8 9 10 |