cognitive psychology. PhD 
Just noticed while pair debugging: lack of live visibility in a programming env becomes more obvious when pairing. “Hey, can you check what type X is?” Live Vis takes better advantage of two pairs of eyes
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But also I guess this is more specifically an argument for Interactivity Considered Harmful and dense data displays. Dense walls of print debug output suck, but I’ve had my pair notice interesting things from that. Eyes are fasthttps://mobile.twitter.com/geoffreylitt/status/995846676177965057 …
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Even though Dijkstra wasn't explicitly cited in Magic Ink, he actually made the same argument in Goto Considered Harmful!pic.twitter.com/2RSLMHGiCY
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Wow awesome find! The second part especially is so key. Abstracting over time is a weirdly powerful and underused idea
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I think the challenge is knowing what to show. Value of printf is you only see exactly the points (you think) you should care about. A full dump of program output is obviously too much. You probably want: 1) Smart defaults 2) Lightweight interactivity 3) Zoomable UI
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