Elegant solution for empty loops

Question

When running trough a collection in the view you can do:

    <% @foo.each do |bar|
    #Do stuff
    <% end.empty? %>
    #if empty stuff
    <% end %>

This is really really nice for the view, but i cant seem to find a way for rake tasks, or other ruby related code.

Is there a nice ruby way of doing this?

EDIT: Solution by @meagar http://rubyfiddle.com/riddles/6d37b/2 Forgot the if

     if foo.each do |bar|
       puts "Bar #{bar}"
     end.empty?
       puts "Foo is empty"
     end

What does that even mean, you "can't find a way for rake tasks or other ruby code"? The code you've written works fine, in our out of ERB. You just need to drop the `<% %>`. That said, why would you want to do this in a rake task? Just use `if @foo.empty? ... else ...` — user229044, Jun 06 '14 at 19:19
This code doesn't work out side of ERB. since end.empty? it's some kind of helper — xhoy, Jun 06 '14 at 19:22
What you've posted doesn't work inside *or* outside of ERB because you're missing an opening `if`. If you'd written it correctly (as written in the answer you linked) it would work just fine outside of ERB. See this if you don't believe me: http://rubyfiddle.com/riddles/6d37b/2 — user229044, Jun 06 '14 at 19:27
`end.empty?` is part of Ruby. It's not a helper, it has nothing to do with ERB. It will work everywhere. — user229044, Jun 06 '14 at 19:31

score 4 · Answer 1 · answered Jun 06 '14 at 19:26

4

The cleanest solution is probably the simplest.

if @foo.empty?
  #Do empty stuff
else
  @foo.each do |item|
    #Do non-empty stuff
  end
end

answered Jun 06 '14 at 19:26

MCBama

1 Answers1