[saghm]

Sure, but to extend your metaphor, using Haskell to teach non-Haskell programmers about monads is like using Thai to teach English speakers the history of Thailand; the language might be better suited for the topic, but the people you're teaching don't know it, and learning it is orthogonal to the actual thing you're trying to teach them.

[toastal]

That's why I said have both with the emphasis on the one that better expresses it so people know what you're aiming for. I've written FP blog posts in the past with Javascript to accompany just in case it wasn't clear because of syntax. But if you'd just looked at the Javascript, your takeaway will probably be similar to many FP-in-JS articles of 'why so much ceremony?' The 'other' language is merely a bridge. And if you can only communicate from the bridge language's perspective, you won't be able to grasp intermediate topics.