I don’t want to judge too hard here, but this – like a few prev. topics of yours – seems to come from a place of shoehorning features available in other languages into elixir. Doing things lazily is totally possible, but I don’t see why there would be the need to do so in a for comprehention.

What’s the problem with this?

a = fn -> long_operation() end
b = fn -> longer_operation() end
a.() + b.()

Anonymous functions and Stream, where stream is specifically for enumerables (so not single values) and it also often uses anonymous functions.

FWIW, I think the difference is in how one asks the question:

“How do you implement this feature/concept from X language in Elixir”
vs.
“In X language you can solve this problem with Y feature/concept. How do you solve this problem in Elixir?”

The first question is centered on how to use concepts and solutions in a language that maybe doesn’t natively or easily support it. The second question centers the problem itself and leads to answers that go directly to idiomatic solutions to common problems. The second question will still produce answers about how those original concepts can be used in Elixir if they exist.

I am OK with that, in previous topics I did create some datatypes that implement the Enumerable protocol to a good level of success. It’s mostly a matter how getting the reduce part of the protocol to actually reduce what I want, which is easier said than done.

I am not sure how to reply to this.

On one hand, you are not wrong. I am absolutely exploring concepts from places that are alien to Elixir and playing around, testing the waters and seeing what I can use and what I cannot.
On the other hand, I don’t see this as being bad. I see this as being positive. I am also of the opinion that I am not the only person doing these kind of experiments.

When I first started creating a desktop application for Elixir many people suggested I moved away and that “this was not the purpose of Elixir”. And today we have things like elixir-desktop.
You may argue, “Yes, but you would have to be delusional to compare you silly questions to a project like elixir-desktop”, which I would agree, however the point I am trying to make here is that many of the new tools and functions elixir has now, come from alien places. Some of them stick around. Others don’t. I make no claim that anything I do will stick to anyone

But if it helps clear the air, then please be kind enough to consider this an academic exercise

This is quite interesting. Do you know where I could contact the developers and ask this question? Perhaps some mailing list?