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I've added the functionality to introduce a variable for a class or when calling a method, e.g.
HelloWorld.new -> hello_world = HelloWorld.new
hello_world.person -> person = hello_world.person
hello_world.person("foo", "bar") -> person = hello_world.person("foo", "bar")
hello_world.person{"foo" => "baar", "bar" => "qux"} -> person = hello_world.person{"foo" => "baar", "bar" => "qux"}
hello_world.person.name("foo", "bar") -> name = hello_world.person.name("foo", "bar")
It's not 100% perfect but works for all the cases above.
I know its not technically a refactoring but is something I have found in every refactoring tool I've ever worked with and find really useful when writing code.
Cheers
Colin Gemmell