How to "source" a string?

[lmiq]

@tomtom

the other hand, I think a “proper” solution is to define a function for each re-using block. But we have to carefully pass in any needed locals as arguments and return any locals that are needed in later codes .

This is the proper solution, without quotes. And that careful passing of parameters and return values is what makes the function reusable. Otherwise you don’t know what the code expects to use, and what it returns as a result, which variables it modifies, you very rapidly would have a code impossible to maintain.