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I've always liked that lambda and functions are the same thing in R and write `function(x){x + 1}`

I dislike both of your examples and am glad to have never seen that in any R code I've met.

it's new as of R 4.1 along with the new pipe operator

https://www.r-bloggers.com/2021/05/the-new-r-pipe/

I prefer the R formula syntax. i.e

~ . + 1 ~ .x + .y

I like this syntax better than the new lambda syntax, but I think it's good that a proper lambda syntax exists now. Not all higher-order functions accept formulas (they have to wrap their function arguments with rlang::as_function or equivalent), and there are probably some obscure cases where the distinction between a formula and a function matters.

What's sad about it?

JS version is more readable for most people.

(I'm no big fan of JS in general, unless it is TS but I consider that a different language.)

Exactly and it could bring R to a larger audience.