After talking how about how reflection works in all its aspects, we will now focus on its downside, when it is used in the standard library, and when to use it in packages.
Reflecting on reflection
Performance cost
Reflection allows code to be flexible and handles unknown data types by analyzing their memory representation. This is not cost-free and, besides complexity, another aspect that reflection influences is performance.
We can create a couple of examples to demonstrate how some trivial operations are much slower using reflection. We can create a timeout and keep repeating these operations in goroutines. Both routines will terminate when the timeout expires, and we will compare the results:
func baseTest(fn1, fn2 func...
