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I am really glad that I took 6 weeks into the #rstats course before I introduced lists. They're really useful, but they're really quite weird for non-programmers. And learning to access elements is really non-trivial.
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The main motivation is that next week I introduce {purrr}. So say a little prayer for us.
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Also, thanks to @KenButler12 for our discussion on {purrr} - it helped a lot in how I formulated the lesson.