>
> *> let: section_counter <- 1, let: lesson_counter <- 1*
>
> My concern about this is that `<-` in for means extracting something from
> the collection, so giving it another meaning inside an option can be quite
> confusing.
>
Makes sense. If I'm not mistaken it actually means pulling the next item
from an enumerable. How about trying to think of the for/let as generating
a new enumerable (stream?) as the "loop" runs? So how about:
for section <- sections,
section_counter <- let(1) do
end
Then how about "previous" instead of "let"?
for section <- sections,
{_value, section_counter, lesson_counter} <- previous({nil, 1, 1}) do
# ...
{section, section_counter + 1, lesson_counter + 1}
end
The semantics would be that "<- previous" extracts the previous result of
the do block. Once could as well do:
for n <- 1..5, p <- previous(1), do: p + n
Best,
Stefan
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