Developers’ Toolkit in the Agile World

by

Maria Diaconu & Alexandru Bolboaca

Code quality & indicators

Bad code? We don’t write bad

code...

...just occasionally

...when under pressure

Ups, we are almost always under pressure

Or

My code is good-enough. Why should I

change it?

About the story tellers

Maria Diaconu

Developer, Technical Lead, Manager Agile/Scrum Practitioner & CoachOwner Mosaic Works

Founder and Coordinator of Romanian Agile community, AgileWorks Romania

About the story tellersAlexandru Bolboaca

Software DeveloperHands-on software consultant@MosaicWorksAspiring software craftsman

Active member of Romanian Agile community, AgileWorks Romania

The fantastic journey of the beginner

craftsman

Programming is fun when you create great

software & write beautiful code

A minimal toolkit on the road

Clean Code

Pair Programming

Emergent DesignTDD

Refactoring

Clean code? What’s that?

Meaningful namesIntention revealing-names

No encodings (e.g. Hungarian notation)

int d; //elapsed time in daysvs

int elapsedTimeInDays

Clean variable names

Small !Do one thing. And it’s DONE well.

Descriptive namesNo sides effects

No duplicated functions

ComputeAndWriteResult()vs

Write(Compute())

Clean functions

Try-Catch-Finally - written firstExpected behavior covered first, exceptions

treated after Don’t return Null; Don’t Pass Null

try { MealExpenses expenses = expenseReportDAO.getMeals(employee.getID()); m_total += expenses.getTotal(); } catch(MealExpensesNotFound e) { m_total += getMealPerDiem(); }

vs

MealExpenses expenses = expenseReportDAO.getMeals(employee.getID()); m_total += expenses.getTotal();

Clean code - error handling

23 + 23 + 23 + 23 + ... + 23or

1000 * 23 ?

Improve maintainability& readability

through changes in small steps keeping the external behavior

Refactoring

RefactoringTo write clean code, you must

first write dirty code and then clean it.

by Robert C. Martin

Refactoring - how toE.g. : Extract methods, class

Move methodsReplace conditions with polymorphism

Eliminate duplicate code Extract data structure

The boy scout ruleIt’s not enough to write the code well. The

code has to be kept clean over time.

by Robert C. Martin

Use the toolkit for building software

incrementally

How we learn useful practices?

Software Craftsmanship

Learn & Practice!&

Practice & Learn!

Code KataCode retreatCoding Dojo

Aspiring craftsmen

@AgileWorks -CodeRetreat/Dojo Bucharest - June

Good code reads like a novel.

Good code reads like a novel.

Excellent code reads like haiku.

... and this is not the end of the journey

Thank you!Maria Diaconu & Alexandru Bolboaca

MosaicWorks - www.mozaicworks.commddiaconu@gmail.com; twitter: fireladyM

www.alexbolboaca.roalexboly@gmail.com; twitter: alexboly

AgileWorks Romania - agileworks.ro