Donald Knuth, on how to tell whether you really understand something (program it):pic.twitter.com/wlGVYRdfhL
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i don't agree. I code things I don't understand all the time. I just try things until they work (like had to calculate a projection from a line recently and I just fumbled around until it worked) -- this way is frequently simpler that trying to "really" understand it
Coding can sometimes be like throwing different words from the dictionary at the taxi driver until he nods and you hopefully end up where you want to go.