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Comment by baddox | Hacker News Reader

In my view, the primary advantage of CoffeeScript was to provide ways to avoid JavaScript footguns. I think that a combination of ES 2015 and wider propagation of best practices have made many such footguns avoidable in practice without using CoffeeScript.

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But it brought along its own footguns. The article has one example

> For example, we had a major production bug in the fall of 2013 due to a misplaced space character.

Definitely my experience. Implicit returns are just a breathtakingly bad idea and I have personally witnessed them cause countless bugs.

I think they can be ok in a language where it’s been well thought out. Like implicit return in clojure has never bugged or surprised me.

Interesting, I've never heard complaints about implicit returns before. I really enjoy them in languages like rust. What kind of bugs?

I recall several resulting from the fact that lodash's _.forEach terminates iteration early if the function you pass it returns a falsey value for any element. Most people (myself included) weren't aware of this functionality and thought of the callback as a void function and weren't even thinking of what the last expression in it would evaluate to.

That just seems like a poor choice of api design for forEach, rather than a fundamental problem with implicit returns.

That matches my experience: the pitch was writing less, safer code but I found that JSHint (back then) had a comparable effect without a stop-the-world migration and a lot of the size reductions weren’t significant compared to following any style standards for naming, comments, etc.

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