unindented code cannot possibly work!

#DCAEC12

Unindented Code Cannot Possibly Work!

Ed Buhain

December 7, 2012

PRIVILEGED AND CONFIDENTIAL. The information contained in this material is privileged and confidential, and is intended only for the use of the individual to whom it is addressed and others who have been specifically authorized to receive it. If you are not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this material is strictly prohibited. If you have received this material in error, please destroy it immediately. #DCAEC12

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The Ariane 5

$7B development

$500M rocket & cargo

Software Based on the Ariane 4

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The Ariane 5

Inertial Reference Systems

On-BoardComputers

Boosters&

Main Engine

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The journey of a thousand miles sometimes ends very, very badly.

- Despair, Inc.

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About Me

NAME: Ed Buhain

COMPANY: Excella Consulting

EMAIL: ed.buhain@excella.com

TWITTER: @buhain

BLOG: blog.buhain.com

#DCAEC12

Unindented Code Cannot Possibly Work!

Ed Buhain

December 7, 2012

PRIVILEGED AND CONFIDENTIAL. The information contained in this material is privileged and confidential, and is intended only for the use of the individual to whom it is addressed and others who have been specifically authorized to receive it. If you are not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this material is strictly prohibited. If you have received this material in error, please destroy it immediately. #DCAEC12

#DCAEC12#DCAEC12

#DCAEC12

SOLID Principles

S - Single Responsibility

O - Open/Closed Principle

L - Liskov SubstitutionI - Interface

SegregationD - Dependency

Inversion

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Unindented code cannot possibly work.

- Jeff Prosise

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Success is dependent on people, process, technology – in that order.

- Jeff Gallimore

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I - Passion

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I - Passion

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II – Communication

Verbal

Written

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II – Communication

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Any fool can write code that a computer can understand.

Good programmers write code that humans can understand.

- Martin Fowler

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Does This Code Work?

If (productNames.Count > 0) Then lblProductName1.Text = productNames(0) lblProductName1.Visible = True End If If (productNames.Count > 1) Then lblProductName2.Text = productNames(1) lblProductName2.Visible = True End If . . . If (productNames.Count > 98) Then lblProductName99.Text = productNames(98) lblProductName99.Visible = True End If

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Does This Code Work?

SELECT a.CustomerName AS a, b.Address1 AS b, b.City AS c, b.PostalCode AS d, c.OrderNumber AS e FROM Customers a INNER JOIN Addresses b ON b.AddressId = a.AddressId INNER JOIN Orders c ON c.CustomerId = a.CustomerId WHERE c.IsProcessed = 0

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Does This Code Work?

// increment j i++;

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Does This Code Work?

string iCustnm; iCustnm = "644"; if (Cust.Has_Orders(iCustnm)) processOrders(iCustnm); else wiatforOrdersw(iCustnm); Display_Customer_Orders(iCustnm.ToString());

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III – Tools & Techniques

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Skynet became self-aware.

- The Terminator

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Know Your Tools!

// Doug H. - 12/11/2010 - Bug 2733 // Rachel G. - 11/17/2010 - Bug 2544 // Doug H. - 11/11/2010 - Bug 2211 // Doug H. - 10/29/2010 - Bug 2211 // Howard W. - 8/6/2010 - Bug 2099 // Norm P. - 4/11/2010 - Bug 1556 // Doug H. - 1/14/2010 - Bug 1444 ProcessPayment(payment);

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Know Your Tools!

/* * * Edited by Doug H. * Thursday 3:45 p.m. * Outside Temperature 38°F * I live at 65 Main Street. * I wish I was on vacation. I have 6 days of vacation left. * */

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CuStOmErADDRESSid

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III – Tools & Techniques

Know Your Tools

Think About Presentation

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You’re Surrounded!

Think of something you think is poorly designed.

Share with your group.

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Pick a group representative.

Share with the whole room.

We’re Surrounded!

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Attractive things work better.

- Donald A. Norman

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Know Your Patterns

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Know Your Patterns

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Know Your Patterns

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Know Your Patterns

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Know Your Patterns

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Know Your Patterns

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You are confirmed on United Airlines flight 2049, departing from Washington-Dulles Airport at 10:00 a.m. on Friday, December 7, 2012 and arriving at Seattle-Tacoma International Airport at 3:00 p.m.

Know Your Patterns

United Flight 2049Washington-Dulles to Seattle-Tacoma

Departs: Fri 12/7 10:00 AMArrives: Fri 12/7 3:00 PM

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Putting It All Together…

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Reading List

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Reading List

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What do you think about when you hear the term legacy code?

… the sort of code that you just wish would die.

- Michael Feathers

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About Me

NAME: Ed Buhain

COMPANY: Excella Consulting

EMAIL: ed.buhain@excella.com

TWITTER: @buhain

BLOG: blog.buhain.com