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user = User.new.tap do |u|
  u.username = "foobar"
  u.save!
end

# has a much better intent than this

user = User.new
user.username = "foobar"
user.save!

5.upto(10) { |i| puts i }

# same as

5.upto(10) do |i| 
   puts i
end