For my own situation, the articles present the right way to express all possible performance/error handling (which is expected in a standard lib) and then goes on to show how I actually code it in my own softawre where I don't really need the level of detail/finetuning of the standard lib.

Interestingly, my life starts at the end of the article, with the simple verison of the code, and as my understanding of rust widens, I go up to the beginning of the article and better define my function...