I'd have thought allowing _ as a synonym for _1 would have been more aesthetically consistent. That's the path I went with when designing my CL #λ reader macro, personally.
I don't understand the point of it when the `.map(&:upcase)` syntax is shorter. This just seems like yet another syntactic sugar Rubyism that doesn't really add anything.
If it's an alternative to the `|x|` syntax when using only one block variable, then I like that.
That only works when calling a method on the things you’re iterating thru, it is a replacement for the single variable block example you gave there
`arr.map { it.thing.blah.stuff }`
The `&:` doesn't work in that context
Not to point any fingers, but shows that the previous commenter have not struggled with this :)