Ruby block/anonymous function placeholder parameter

Question

I'm looking for the following syntax in Ruby[1,2,3].map {|n| f(n)} -> [1,2,3].map(f(_)). In Scala it's called a placeholder parameter.

Would it be possible to implement in ruby itself? Are there plans of adding some form of this syntax to the ruby language?

Answer 1

There isn't yet, but it may happen soon. The most likely syntax (as of 2019-08-29) would be

[1, 2, 3].map { f(_1) }

You can read the feature request here; the follow-up discussion here is a more recent take on it.