This Week I Learned #9

Here are some of the things I learned this week, in the order I’ve noted them down.

  • The current chain of events unfolding across the US made me realize how much work still needs to be done in a country that prides itself on equality and justice. #BLM

  • Tools for better thinking (link). A nifty website with an assortment of techniques and frameworks to help with decision making and problem solving. The Dropbox Design blog has more on some of these models.

  • Circle packing (Wikipedia). I was introduced to the concept of packing density in business school as part of a product design and packaging workshop, but I never had the chance to take a look at the math behind it. Geometry is beautiful.

# Programming

  • The UI on the Crew Dragon was built using Web technology running on Chromium, according to this AMA.

  • I’ve used Swift key paths here and there, but I never explored the lesser known parts of this API. This week I picked up AnyKeyPath and PartialKeyPath<Root> and used them for a server-side project I am working on (link).

  • Android phones seem to be crashing when using a particular image as a wallpaper (link). According to this Twitter thread, the issue happens during color space conversion, where the formula used to create a pixel lightness matrix rounds the color values up, resulting in a RGB sum greater than 255.1 This in turn causes an out-of-bounds exception that keeps happening every time the system UI process restarts.

  1. This formula is formally called sRGB Luma (Rec. 709). I’ve written more about it and other color lightness topics here.
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