Previous thread: https://news.ycombinator.com/item?id=21720656
Readit Newsfyp commented on Quadratic Method: Detailed Explanation (2020) poshenloh.com/quadraticde... · Posted by u/aleyan
There are a lot of similar failure modes in humans.
Sometimes they're are used for good, like making drivers slow down: https://www.insider.com/optical-illusions-3d-crosswalk-drivi...
But other times they cause crashes: https://imgur.com/a/kYr94
fyp commented on The Great CoffeeScript to Typescript Migration of 2017 dropbox.tech/frontend/the... · Posted by u/dgoldstein0
I fully remember picking up coffeescript because Dropbox had used it. I only ever used it on one project. I try and remember that every time I have the urge to go with Reason, Elm or even wasm compiling things. Long live JS.
I don't know the details but I heard the original codebase was javascript but they used an automated script to convert it to coffeescript as an hack week project! That's some serious long term damage they did in that one week.
Edit: Found the 2012 post, pretty useful for doing a postmortem https://dropbox.tech/application/dropbox-dives-into-coffeesc...
fyp commented on My robotic basketball hoop won't let you miss [video] youtube.com/watch?v=FycDx... · Posted by u/o10449366
Another similar project by Mark Rober for darts: https://www.youtube.com/watch?v=MHTizZ_XcUM
fyp commented on Using PostgreSQL for JSON Storage info.crunchydata.com/blog... · Posted by u/craigkerstiens
This is probably premature optimization, but what's the performance cost of updating a deeply nested field inside a jsonb? What about indexing it?
(compared to storing in some normalized form or in other popular document stores)
fyp commented on Lyft lays off 17% of workforce, furloughs hundreds more cnbc.com/2020/04/29/lyft-... · Posted by u/organicfigs
Uber/airbnb/lyft were considered in the same tier as facebook/google before corona. With google also slowing hiring, are the engineers laid off all going to be absorbed by facebook?
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fyp commented on Ask HN: What scientific phenomenon do you wish someone would explain better? · Posted by u/qqqqquinnnnn
What happens when you actually fall inside a black hole and what is the singularity.
I never really understood what happened really when the guy fell inside it in Interstellar and how come he started seeing all those photos. I just accepted it as Hollywood bs.
I know my question is based on a movie but would still like to know what will someone witness (assuming of course they somehow live)
I have not read it myself but the answer can probably be found in the book "The Science of Interstellar" [1]
Kip Thorne, a Nobel prize-winning physicist, worked as the science advisor for Interstellar so the hollywood bs is pretty good!
[1]: https://www.amazon.com/Science-Interstellar-Kip-Thorne/dp/03...
fyp commented on Which is better on Android: divide by 2 or shift by 1? jakewharton.com/which-is-... · Posted by u/zdw
Another fast way to double a number is to add it to itself.
Isn't that the wrong direction for the optimization? I would assume you would want to compile adding two numbers into shifting by one, not the other way around.
(I know nothing about hardware, it just intuitively seems like moving a bunch of bits over by 1 should be faster than dealing with xor and carries)
In particular, there's no formula for polynomials of degree 5 or higher.
https://en.wikipedia.org/wiki/Abel%E2%80%93Ruffini_theorem