Comment by Cthulhu_

This is good wisdom, and I think this is a strong reason why language and runtime developers should ensure their standard library is (over)complete.

Go does this well, to the point where a lot of people in the community say "you don't need a library" for most use cases, only for e.g. database drivers. This is contrary to what a lot of developers believe, that they need e.g. a REST API library or enterprise application framework as soon as possible.