Ruby style poll

gistfile1.rb

#Do you prefer this?

      merchant["thing"] = important_stuff.map { |important_thing| important_thing["units"] }.inject(&:+)

#Or this?

      important_stuff.each { |important_thing| merchant["thing"] += important_thing["units"] }


#Why? Is it completely objective? Or are ruby's idioms/social mores/conventions the deciding factor?

I still like the .sum solution, but @fredericksgary's point is what makes me like #1 a little more than just an inject.

Is there something that makes a pure inject clearer than solution #1? Objectively, it's one loop vs two. You could argue that one loop is executing fewer instructions, but I think two simple loops is clearer than one (slightly) more complex one.