Peñá wrote:
> some simple example,
> 
> irb(main):014:0> def with x, &block
> irb(main):015:1>    x.instance_eval &block
> irb(main):016:1> end
> => nil
> irb(main):017:0> with "test" do
> irb(main):018:1*   p length
> irb(main):019:1>   p upcase
> irb(main):020:1>   p capitalize
> irb(main):021:1>   p self
> irb(main):022:1> end
> 4
> "TEST"
> "Test"
> "test"
> => nil
> irb(main):023:0>
> 
> kind regards -botp
> 

Another way:

class Object
   def with &block
     yield self
   end
end

verylongobject = "Hakuna Matata!"

verylongobject.with do |o|
   puts o #-> Kakuna Matata!
   puts o.length #-> 14
   puts o.reverse #-> !atataM anukaH
   puts o.upcase #-> HAKUNA MATATA!
end