Enumerable#maph is a trivial method (really trivial, in Ruby 3 syntax its definition is def maph(k) = map { _1[k] }) that nevertheless makes working with arrays of hashes a bit nicer.
Why define a block when you don't have to?
Usage:
pks.sort_by { |f| f["pk"] }.map { |f| f["name"] }
turns into:
pks.sort_by { |f| f["pk"] }.maph("name")
maph works with Symbols and Strings, and for that matter on anything that responds to the index operator.
To add support for other Enumerable methods than map we can add a method to Enumerator. I'll name the method key.
class Enumerator
def key(k) = each { _1[k] }
end
Then we can turn our previous example into pks.sort_by.key("pk").map.key("name")