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Refactoring Ruby
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Anatoli Makarevich
April 23, 2013
Programming
2
250
Refactoring Ruby
Short talk about refactoring and Ruby code complexity analysis.
Anatoli Makarevich
April 23, 2013
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Transcript
Refactoring. Ruby edition. Anatoli Makarevich @makaroni4
Who am I?
Our projects look like
In next 15 minutes we will • spice up our
knowledge about refactoring • look at some common smells • get acquainted with automated code analysis • become ready to refactor
Refactoring is but NOT writing tests changing code reducing complexity
adding new features
Refactoring != Moving backwards
To grow fast you need to grow right.
What refactoring does? Complexity Readability Maintainability Extensibility
This is scientific! Martin Fowler, 1999
Your desk books are:
Code Smell Any symptom in the source code of a
program that possibly indicates a deeper problem Kent Beck
Let’s smell it!
Code smells Long method Duplications Heavy class Stupid name Too
many params Feature envy Ubercallback Complex conditions
Refactoring cycle Check test coverage Write tests if needed Change
code Ensure that tests pass Check overall complexity
Find code smells Check test coverage Write tests if needed
Change code Ensure that tests pass Check overall complexity
Check test coverage Check test coverage Write tests if needed
Change code Ensure that tests pass Check overall complexity
Write new tests if needed Check test coverage Write tests
if needed Change code Ensure that tests pass Check overall complexity
reFACTOR Check test coverage Write tests if needed Change code
Ensure that tests pass Check overall complexity
Ensure that tests pass Check test coverage Write tests if
needed Change code Ensure that tests pass Check overall complexity
Automate tests! Check test coverage Write tests if needed Change
code Ensure that tests pass Check overall complexity Travis CI Jenkins CI Gitlab CI
Automate complexity analysis? Check test coverage Write tests if needed
Change code Ensure that tests pass Check overall complexity
Could complexity analysis be automated?
? How can we process code?
s(:class, :Sexp, s(:const, :Array), s(:defn, :sexp_type, s(:args), s(:call, nil, :first)),
s(:defn, :sexp_body, s(:args), s(:call, nil, :[], s(:lit, 1..-1)))) S-expressions
s(:class, :Sexp, s(:const, :Array), s(:defn, :sexp_type, s(:args), s(:call, nil, :first)),
s(:defn, :sexp_body, s(:args), s(:call, nil, :[], s(:lit, 1..-1)))) Sexp operator
s(:class, :Sexp, s(:const, :Array), s(:defn, :sexp_type, s(:args), s(:call, nil, :first)),
s(:defn, :sexp_body, s(:args), s(:call, nil, :[], s(:lit, 1..-1)))) Sexp body
Automated analysis • Long methods • Complex class • Stupid
variable name
Long method s(:class, :Sexp, s(:const, :Array), s(:defn, :sexp_type, s(:args), s(:call,
nil, :first)), s(:defn, :sexp_body, s(:args), s(:call, nil, :[], s(:lit, 1..-1)))) Find method Sexp :defn
Long method s(:class, :Sexp, s(:const, :Array), s(:defn, :sexp_type, s(:args), s(:call,
nil, :first)), s(:defn, :sexp_body, s(:args), s(:call, nil, :[], s(:lit, 1..-1)))) Find method Sexp :defn Count sexp operators
Complex class s(:class, :Sexp, s(:const, :Array), s(:defn, :sexp_type, s(:args), s(:call,
nil, :first)), s(:defn, :sexp_body, s(:args), s(:call, nil, :[], s(:lit, 1..-1)))) Find method Sexp :class
Complex class s(:class, :Sexp, s(:const, :Array), s(:defn, :sexp_type, s(:args), s(:call,
nil, :first)), s(:defn, :sexp_body, s(:args), s(:call, nil, :[], s(:lit, 1..-1)))) Find method Sexp :class Cound weights of Sexp operators
Stupid variable name s(:class, :HomerSimpson, s(:const, :BlahBlahBlah), s(:defn, :donuts, s(:args),
s(:call, nil, :fist)), s(:defn, :beersnstuff, s(:args), s(:call, nil, :[], s(:lit, 1..-1))))
Automated analysis
Refactoring != Rehacktoring @katrinyx
It is about perception We READ code, NOT COMPILE it.
After this talk do: • gem install flog • gem
install flay • gem install reek • flog PROJECT_PATH • flay PROJECT_PATH • reek PROJECT_PATH
Let’s refactor! Anatoli Makarevich @makaroni4