Can you please elaborate on what exactly the “err” parameter in exercise 12 is doing?
I tried breaking the code and seeing how far I could get with running the code without it, and it breaks on line 13:
fs.readFile(“test.txt”, print_lines);
with the error “cannot read properly toString of null.”
wouldn’t the “data” parameter be fulfilled with test.txt.
Thank you for your explanation and I hope my question makes sense.