Soon after starting a project, you will start getting a lot of functions, and you may ask, where should I put their code? You will likely want to have a compact main.red file, which starts your program and can call functions stored in other files.
Let's say one of these files is called useful-functions.red, and contains the functions fact from the previous section and the check function:
;-- see Chapter06/useful-functions.red:check: func [list] [ answer: "safe" foreach l list [ if find l "--" [answer: "unsafe"] ] answer]
What it does is not that important here. It goes through a list of names, and returns the safe string, but if any name in the list contains --, check returns the unsafe string.
This is depicted ...
