> how does this project compare to differential dataflow? I may ask a stupid question, but from reading the description on the page you linked, how are timely

> how does this project compare to differential dataflow? I may ask a stupid question, but from reading the description on the page you linked, how are timely and differential dataflow different from implementation details of 80s reactive programming such as SIGNAL (https://ieeexplore.ieee.org/document/97301 https://ieeexplore.ieee.org/document/97301) ? > Differential dataflow programs look like many standard "big data" computations, borrowing idioms from frameworks like MapReduce and SQL. However, once you write and run your program, you can change the data inputs to the computation, and differential dataflow will promptly show you the corresponding changes in its output. Promptly meaning in as little as milliseconds.