As soon as I use the same code twice, I try to make it into a generic component. The same logic twice becomes a function. The same concept twice becomes a packa

As soon as I use the same code twice, I try to make it into a generic component. The same logic twice becomes a function. The same concept twice becomes a package in a shared library. Emphasis on "try": Some languages make it difficult to avoid code duplication in certain situations. (Looking at you, Go...) I allow code duplication if it's more readable than trying as hard as possible to refactor out common parts. For Go-based API-driven services, we have collected some of these reusable modules and functions at https://github.com/sapcc/go-bits https://github.com/sapcc/go-bits.