Reactive Programming is a style of programming that provides developers with a set of abstractions that facilitate event handling and stream processing. Traditional debug tools lack support for Reactive Programming, leading developers to fallback to the most rudimentary debug tool available: logging to the console. In this paper, we present the design and implementation of RxFiddle, a visualization and debugging tool targeted to Rx, the most popular form of Reactive Programming. RxFiddle visualizes the dependencies and structure of the data ow, as well as the data inside the ow. We evaluate RxFiddle with an experiment involving 111 developers. e results show that RxFiddle can help developers nish debugging tasks faster than with traditional debugging tools. CCS CONCEPTS •So ware and its engineering → So ware testing and debugging; Data ow languages; So ware maintenance tools;
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