[orangecat]

Can you tweak your function to stop filling the first time a zero is encountered? That's a simple one-line change with the for loop, but a puzzle for the functional iteration.

Yes, and that's exactly why you should use constructs like map when possible. With a manual loop you have to scan more code to verify that it's not doing something more complicated.

[infogulch]

To drive parent's point home a bit, I skimmed both examples above when reading and without looking again I am very certain that the map example does not have any weird iteration semantics (eg "stop filling the first time a zero is encountered"), but I'm not sure that the for loop example is similarly 'normal' -- I'd have to check the condition again more carefully.