Show HN: Tetris in a PDF
962 by ThomasRinsma | 173 comments on Hacker News.
I realized that the PDF engines of modern desktop browsers (PDFium and PDF.js) support JavaScript with enough I/O primitives to make a basic game like Tetris. It was a bit tricky to find a union of features that work in both engines, but in the end it turns out that showing/hiding annotation "fields" works well to make monochrome pixels, and keyboard input can be achieved by typing in a text input box. All in all it's quite janky but a nice reminder of how general purpose PDF scripting can be. The linked PDF is all ASCII so you can just open it in a text editor, or have a look at the source code here: https://ift.tt/iMZtQ39
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U.S. Postal Service starts nationwide electric vehicle fleet, buying 9,250 EVs 444 by lxm | 336 comments on Hacker News.
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By BY MATT STEVENS AND MAGGIE HABERMAN from NYT U.S. https://ift.tt/2EQzU0Y via IFTTT
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Game of Life, simulating itself, infinitely zoomable 759 by surprisetalk | 169 comments on Hacker News.
