gistfile1.txt

def nested_hash_value(obj,key)
  if obj.respond_to?(:key?) && obj.key?(key)
    obj[key]
  elsif obj.respond_to?(:each)
    r = nil
    obj.find{ |*a| r=nested_hash_value(a.last,key) }
    r
  end
end

Should be something like

function findPlacement(obj) {
  if(obj.placement != null) {
    //yay placement
  }
  if(obj.sections) {
      obj.sections.forEach(findPlacement);  
  }
}