Code as a Communication Tool

Vinicius Gomes

Mozair

May, 23rd 2011

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AKA Usando as Linguagens ao Seu Favor

• About us

• Introduction

• What?

• Why?

• How?

• Conclusion

Agenda

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• About us

• Introduction

• What?

• Why?

• How?

• Conclusion

Agenda

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About us

Vinicius Gomes

• about.me/vvgomes

Mozair

@MACSkeptic

github.com/macskeptic

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• About us

• Introduction

• What?

• Why?

• How?

• Conclusion

Agenda

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Introduction

Reading existing code is

expensive

Understanding existing

code is expensive

Finding out where to

change is expensive

Maintenance is expensive

So, what to do?

• About us

• Introduction

• What?

• Why?

• How?

• Conclusion

Agenda

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What?

Communicate through

code effectively

Make it fast to read

Make it easy to understand

Express domain knowledge

through software

Keep maintenance costs

low

• About us

• Introduction

• What?

• Why?

• How?

• Conclusion

Agenda

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Why?

Maintenance

Tech Debt

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Time to market vs. Technical debt

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• XP

–Communication

–Simplicity

–Feedback

–Courage

–Respect

What we do

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Feedback

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Feedback

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Project1

Unitary

Project1

Functional

Project2

Unitary

Project2

Functional

Project1

Regression

Project2

Regression

Help your team

Help your team

• Make people more productive

Help your team

• Make people more productive

• Avoid ambiguous interpretation

Help your team

• Make people more productive

• Avoid ambiguous interpretation

• Drop stress levels

Help your team

• Make people more productive

• Avoid ambiguous interpretation

• Drop stress levels

• Help people to focus on the right things

• About us

• Introduction

• What?

• Why?

• How?

• Conclusion

Agenda

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How?

• Language constructs

• Language constructs

• Implementation Patterns

• Language constructs

• Implementation Patterns

• Domain Driven Design

• Language constructs

• Implementation Patterns

• Domain Driven Design

• Test Driven Development / Design

• Language constructs

• Implementation Patterns

• Domain Driven Design

• Test Driven Development / Design

• Refactoring

• Language constructs

• Implementation Patterns

• Domain Driven Design

• Test Driven Development / Design

• Refactoring

• Domain Specific Languages

Language constructs

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Avoid the Comic Sans Effect

Tell “what”, not “how”

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Implementation

Patterns

Name by role

Abiding by the law of Demeter

Abstraction symmetry

One-line ifs

Test Driven

Design/Development

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Refactoring

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Domain Specific

Languages

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• About us

• Introduction

• What?

• Why?

• How?

• Conclusion

Agenda

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Conclusion

Start to think about the

code as a communication

tool

Harness the power of the

tools at hand

Make the code talk the

domain knowledge

Write code for human

beings

More Information

XP Explained by Kent Beck

TDD by Example by Kent Beck

Implementation Patterns by Kent Beck

Refactoring by Martin Fowler

Clean Code by Bob Martin

Domain Driven Desing by Eric Evans

Literate Programming by David Knuth

about.me/vvgomes @MACSkeptic

Thanks :)

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