Coding Dojo: Data Munging (2016)

Coding Dojo:
Data Munging
(without control structures)
Peter Kofler, ‘Code Cop’
@codecopkofler
www.code-cop.org
Copyright Peter Kofler, licensed under CC-BY.

Peter Kofler
• Ph.D. (Appl. Math.)
• Professional Software
Developer for 15+ years
• “fanatic about code quality”
• Freelance Code Mentor
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY

I help development teams with
●
Professionalism
●
Quality and
Productivity
●
Continuous
Improvement

Mentoring
●
Pair Programming
●
Programming
Workshops
●
Deliberate
Practice, e.g.
Coding Dojos

Developing Quality
Software Developers

Dojo Structure
●
Introduction 15'
●
Coding 60'
●
Retrospective 15'
●
Break 15'
●
Coding 60'
●
Retrospective 15'

Coding Dojo Mindset
●
Safe place outside
work
●
We are here to learn
●
Need to slow down
●
Focus on doing it right
●
Collaborative Game

Coding Dojo Rules

Pair Programming & TDD
●
regular Pair Programming
●
do not talk for too long
●
do not interrupt the other
●
no “keyboard hugging“
●
use TDD (or at least “sort of” TDD)
●
write a test before you write code
●
refactor mercilessly
●
no debugger

Constraints
●
Challenges during a dojo or coderetreat
●
Moving to the extreme is a way of learning
●
Examples
●
Missing Tool (No Mouse, …)
●
Missing Feature (No IFs, …)

Constraint: Complexity One

Cyclomatic Complexity One
●
No conditional statements (if, switch, ?:)
●
No loops (for, while, loop, etc.)
●
Technically no control structures.
●
Use Optional or Maybe type.
●
Use higher order functions like map,
filter and reduce instead.

Assignment Part 1

Weather “Data Munging“
●
weather.dat contains daily weather
data for a month.
●
Find the day number (column one)
●
with the smallest temperature spread.
(Max temperature is second column,
min temperature is third column.)

Prepare
●
Find a pair.
●
Choose a programming language.
●
Set up the environment.
●
Create new project.
●
Add testing framework.
●
Check part1/requirements.txt.
●
Implement Data Munging.

Don't Focus on
Getting it Done.
F0cus on Doing
It Perfectly.

Assignment Part 2

Soccer “Data Munging“
●
football.dat contains the results
from the English Soccer League.
●
The columns 'F' and 'A' contain the total
number of goals scored for and against
each team.
●
Find the name of the team
●
with the smallest difference in 'for' (F)
and 'against' (A) goals.

Assignment Part 3

DRY Fusion
●
Take the two programs written,
●
factor out as much common code as
possible,
●
leaving you with two smaller programs
●
and some kind of shared functionality.

Closing Circle
●
What did you learn today?
●
What surprised you today?
●
What will you do
differently in the
future?

Peter Kofler
@codecopkofler
www.code-cop.org
Kata by
Dave Thomas
@pragdave
http://codekata.com/kata/kata04-data-munging/

CC Images
●
Bruce http://www.flickr.com/photos/sherpas428/4350620602/
●
pairing http://www.flickr.com/photos/dav/94735395/
●
agenda http://www.flickr.com/photos/24293932@N00/2752221871/
●
dojo http://www.flickr.com/photos/49715404@N00/3267627038/
●
rules http://www.flickr.com/photos/phunk/4188827473 x
●
maze https://www.flickr.com/photos/cyberslayer/952953634
●
weather https://www.flickr.com/photos/enki22/8255595370/
●
stadium https://www.flickr.com/photos/113417287@N08/13994724156/
●
DRY https://www.flickr.com/photos/draconianrain/896834248/
●
wants you http://www.flickr.com/photos/shutter/105497713/

Coding Dojo: Data Munging (2016)

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