-@items.each do |item|
 %tr
  %td
   =item.quantity
   times
  %td= item.product.title
 end

-@items.each { |item|
 %tr
  %td
   =item.quantity
   times
  %td= item.product.title
 }

- @things.each do |thing|
  %p= thing.to_s
-end unless @dont_show_things

= @things.map do |thing|
  - do_something_with(thing)
-end.join(",")

- @items.each do |item|
  %tr
    %td
      = item.quantity
      times
    %td= item.product.title

:ruby
  some_lambda = ->(thing) {
    thing.do_stuff
  }

= some_lamba[@a_thing]