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I just completed "Toboggan Trajectory" - Day 3 - Advent of Code 2020 adventofcode.com/2020/day/3 using

Lessons (re-)learnt:
* did you know that example data is also data? I'd forgotten it! Using that for testing made things easier - when I finally thought of it - since it's so much smaller and easier to eyeball.
* Julia's dynamism came back to bite in the usual way it does - since there's no variable declarations required, when I messed up a variable name change and left the old name in in some places, Julia was happy to treat those as two separate variables and end up with weird results.
* Repl.it has a decent mode, but is otherwise a pain to use; it messes with outputs and makes error messages so much harder to read.
* Good practices are good practices for a reason. Magic numbers and baked-in literals are fertile grounds for bugs, even in little one-off projects like this.
* Naming things is hard!

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