with.rb

# Consider this common pattern...

if (user = User.find params[:id])
  user.profile_viewed
end

# Would be a bit less awkward if...

with User.find params[:id] do |user|
  user.profile_viewed
end

# And all we need is...

def with(item)
  yield item if item
end

# But what if we wanted iteration...

with_each User.all do |user|
  user.profile_viewed
end

# Of course that's going too far...
# We already have Enumerable#each

# This is all just syntax sugar.