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Legacy codes
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Kuncara Adi Nugraha
April 01, 2016
Programming
0
3.2k
Legacy codes
What's legacy codes? What should we do with it?
Kuncara Adi Nugraha
April 01, 2016
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Transcript
Legacy Code Sleman, April 1st, 2016
What is legacy code? Code we’ve gotten from somewhere else
Demoralising code (big ball of mud) Code without unit tests
None
Characteristics Poor Architectures Without tests Poor written documentation Oral documentation
IT’S WORKING!!!
IF IT’S WORKING, THEN WHY CHANGE IT ???
Reasons to change Legacy Code Kill some BUGS! Add new
FEATURES Do some OPTIMISATIONS Add new automations things ( tests, scaling, etc)
None
Reasons not to change Legacy Code It looks ugly I
would like to see nicer code I want to use new shiny tools ….
What do we do? REWRITE?
BOOOOMMMM!!!
STOP!! DON’T REWRITE It takes time Need business analysis Features
will keep coming Breeding new bugs
Working Code is OK
What do we do? You can rewrite but you cannot
rewrite all Fight temptations to refactor a lot of codes DO IT SLOWLY AND CALMLY!!
2 Kinds of Refactoring Edit and Pray Cover and Modify
Edit and Pray Steps Find boundaries Discover the codes Refactor
/ Rewrite Run it and do smoke tests Pray that everything is okay
Cover and Modify Steps Find boundaries Discover the code Start
write tests around the to-be- refactored code Do refactor / rewrite Tests and ensure its working
Find Boundaries Act at one part of code at a
time Domains FTW
Discover the Code Read documentations Interview previous developers Read the
codes Try the codes
Prepare and Write Tests Surround it with tests ( integration,
GUI, unit tests, exploratory tests ) Testing is an investment
Write Code to make it Pass! SELF EXPLANATORY! ^_^
THANKS!!