While I agree with this, it's an interesting thought experiment to think about what kind of IDE would work well on a smartphone. I'm sure Gregory isn't the only one wishing to do more during a cramped commute. E.g. UE4 had a kind of graph editor that worked pretty well for a bunch of cases and could be converted easily into code. For certain declarative language there might be a 1-to-1 correspondence between code and graphs.
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