Agileee Developers Toolkit In The Agile World

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

My code is good- enough. Why should I change it?

About the story tellers Maria Diaconu Developer, Technical Lead, Manager Agile/Scrum Practitioner & Coach Owner Mosaic Works Founder and Coordinator of Romanian Agile community, AgileWorks Romania

About the story tellers Alexandru Bolboaca Soft ware Developer Hands-on soft ware consultant@MosaicWorks Aspiring soft ware craftsman Active member of Romanian Agile community, AgileWorks Romania

The fantastic journey of the beginner craftsman

Programming is fun when you create great soft ware & write beautiful code

A minimal toolkit on the road Refactoring TDD Clean Code Emergent Design Pair Programming

Clean code? What’s that?

Clean variable names Meaningful names Intention revealing-names No encodings (e.g. Hungarian notation) int d; //elapsed time in days vs int elapsedTimeInDays

Clean functions Small ! Do one thing. And it’s DONE well. Descriptive names No sides effects No duplicated functions ComputeAndWriteResult() vs Write(Compute())

Clean code - error handling Try-Catch-Finally - written ﬁrst Expected 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();

Refactoring 23 + 23 + 23 + 23 + ... + 23 or 1000 * 23 ? Improve maintainability & readability through changes in small steps keeping the external behavior

Refactoring To write clean code, you must ﬁrst write dirty code and then clean it. by Robert C. Martin

Refactoring - how to E.g. : Extract methods, class Move methods Replace conditions with polymorphism Eliminate duplicate code Extract data structure

The boy scout rule It’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 soft ware incrementally

How we learn useful practices?

Soft ware Craftsmanship

Learn & Practice! & Practice & Learn!

Code Kata Code retreat Coding 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.com mddiaconu@gmail.com; t witter: ﬁreladyM www.alexbolboaca.ro alexboly@gmail.com; t witter: alexboly AgileWorks Romania - agileworks.ro

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Agileee Developers Toolkit In The Agile World

by Agileee on Sep 24, 2009

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Agileee Developers Toolkit In The Agile World — Presentation Transcript