Code refactoring workshop (in Javascript)

Oct 1, 20180 likes144 views

This document discusses code refactoring in Javascript. It introduces refactoring and defines it as changing code without altering external behavior but improving internal structure. The document outlines an agenda including an introduction, examples, and a coding activity. It discusses code smells that indicate needs for refactoring, such as duplicated code. It emphasizes testing during refactoring and focusing on small, incremental changes. The overall message is that refactoring improves code quality and maintainability over time.

Software

Code Refactoring
in Javascript
Ilias Bartolini

Agenda
●
Introduction to Refactoring
●
Initial setup exercise
- break -
●
Refactoring examples
●
You own refactoring
journey

Coding activity
Writing code
Reading code

“Any fool can write code that a computer
can understand. Good programmers write
code that humans can understand.”
- Martin Fowler

Refactoring
“Refactoring is the process of changing a
software system in such a way that it does
not alter the external behavior of the code
yet improves its internal structure.”
- Martin Fowler

Hello demo exercise
●
Set up in pairs
...and exchange keyboard often!
●
Get the codebase
$ git clone
github.com/iliasbartolini/code_refactoring
$ cd code_refactoring
$ npm install
$ npm test
●
Check the /1_hello/ example

See: https://refactoring.com/catalog/

See: https://refactoring.guru

Some refactoring...
Rename method, variable, class, …
Replace magic numbers
Extract / Inline method or function
Extract / Inline variable
Move method, Extract class
Replace if/switch with polymorphism
Pull up / Push down method, Extract interface
Replace inheritance with delegation

And some smells...
Source: iStock Michał Ludwiczak

Code smells and refactoring
Treatment
●
Extract duplicate part
●
Extract & split
●
Introduce class
●
Move responsibility
●
Split responsibilities
●
Introduce polymorphism, ...
●
Delete, delete, delete
●
Rename / Extract method
Symptom
●
Duplicated code
●
Long function/class
●
Long list of parameters
●
Code “envy”
●
Divergent changes
●
Common if/switch lists
●
Speculative generic code
●
Code comments
//are like a deodorant

Practice!
Check the examples in order
/2_date_parser/
/3_direction/

Let’s focus on baby steps!
1) Identify a smell
2) Make a refactoring
3) Run tests!
4) Repeat
●
Write down the list of
smells you see and
refactoring you apply
●
Remember to swap
keyboard ;)

Practice!
Check the examples in order
/4_order_receipt/
/5_rover/

Good design makes you faster
https://www.martinfowler.com/bliki/DesignStaminaHypothesis.html

Myths
“You don’t need to refactor
your test code”

TDD
Test Driven Development
Write a
test first
Implement
solution
Refactor
Commit
Add more tests

“Test code” is “code”
...and should be maintained
with the same quality criteria

Myths
“We need to stop the project
for this refactoring”

Boy scout rule
“Leave the campground
cleaner than you found it.”

Summary
●
Change code in “baby steps”
●
Make use of a test suite
●
Learn to identify “smells”
●
Try to make your code “obvious”
●
Continuously improve the “code design”
●
Practice, practice, practice makes perfect
:)

Feedback
bit.ly /
<add a feedback link>
Thank you! :)

This work is licensed under a Creative Commons
Attribution-ShareAlike 3.0 Unported License.
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Slides template:
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Images credits:
https://www.flickr.com/photos/dietjay/3140774470/
https://www.flickr.com/photos/147489968@N06/
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