Many years ago, I took part in the development of a taxi-hailing mobile app that is still widely used today. I don’t know what kind of code they’re running now, but in those early days, the driver assignment code –if I remember it correctly– was similar in spirit to the grossly simplified example that follows. There are five levels of nested if statements in less than 30 lines of code. It doesn’t look so bad, some might say, but it’s not difficult to imagine how complicated this code can become with just a few more checks…
My issue with this is that it works well with sample code but not as well with real-world situations where maintaining a state is important. What if
rider.preferenceswas expensive to calculate?Note that this code will ignore a rider’s preferences if it finds a lower-rated driver before a higher-rated driver.
With that said, I often work on applications where even small improvements in performance are valuable, and that is far from universal in software development. (Generally developer time is much more expensive than CPU time.) I use C++ so I can read this like pseudocode but I’m not familiar with language features that might address my concerns.