alt Hacker NewsThat doesn't make any sense to me.
When the code is written, it's all laid out nicely for the reader to understand quickly and verify. Everything is pre-organized, just for you the reader.
But in order to write the code, you might have to try 4 different top-level approaches until you figure out the one that works, try integrating with a function from 3 different packages until you find the one that works properly, hunt down documentation on another function you have to integrate with, and make a bunch of mistakes that you need to debug until it produces the correct result across unit test coverage.
There's so much time spent on false starts and plumbing and dead ends and looking up documentation and debugging when you code. In contrast, when you read code that already has passing tests... you skip all that stuff. You just ensure it does what it claims and is well-written and look for logic or engineering errors or missing tests or questionable judgment. Which is just so, so much faster.
> But in order to write the code, you might have to try 4 different top-level approaches until you figure out the one that works , try integrating with a function from 3 different packages until you find the one that works properly
If you haven’t spent the time to try the different approaches yourself, tried the different packages etc., you can’t really judge if the code you’re reading is really the appropriate thing. It may look superficially plausible and pass some existing tests, but you haven’t deeply thought through it, and you can’t judge how much of the relevant surface area the tests are actually covering. The devil tends to be in the details, and you have to work with the code and with the libraries for a while to gain familiarity and get a feeling for them. The false starts and dead ends, the reading of documentation, those teach you what is important; without them you can only guess. Wihout having explored the territory, it’s difficult to tell if the place you’ve been teleported to is really the one you want to be in.