Going the Extra Mile

Going the Extra Mile in

building Beautiful & Scalable Applications

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Karthik Kastury

B.E. Information ScienceEngineer / Hacker / Blogger / Apple fanboi and evil minded. *Pun Intended*

24x7 Internet Geek | Unlucky in Cards

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Twitter

Emailhttp://karthik.kastury.in/hello@karthik.kastury.in@KarthikDot

Internet Addict for 11+ Years...

#ExtraMileNitte..............................................................................................................

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Ready to Dive in?..............................................................................................................

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What? Why? How?> >

Conclusion..............................................................................................................

WHAT?..............................................................................................................

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What we do today

‣Traditional Development Tools like .NET or JAVA with their IDE’s.

‣Development in teams can be tricky at best.

‣Testing, Documentation are usually ignored, or need separate tools themselves.

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OUCH!..............................................................................................................

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OMG!..............................................................................................................

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Some might like this, but it's mostly because most Software

Development Tools are designed for computers, not for human beings.

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They treat you like a Baby

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LEARNING TO WALK..............................................................................................................

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When you are the

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BOSS..............................................................................................................

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Is it Bad?

‣Development, Testing, Debugging are different cycles. *

‣Documentation is often ignored, or left to another team.

‣Collaboration between teams, Version Control are different tools, and not standards based.

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..............................................................................................................* Until VS 2010

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WHY?..............................................................................................................

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There are no traffic jams along the extra mile “ ”ROGER STAUBACH

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‣Personal ambitions

‣Clients will you ( Yes, this is good )

‣You will get noticed

‣More opportunities ...

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CODING CAN BE FUN!..............................................................................................................

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HOW?..............................................................................................................

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How?‣Use modern Development Languages.

‣Go beyond Relational Databases (NoSQL)

‣The Internet (Mobile) is the ONLY platform going forward.

‣Social Coding Platforms is the key to Success.

‣Be bold enough to break the traditions.

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Buzz Words

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GET REAL..............................................................................................................

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GETTING REAL

‣Build the Real thing first.

‣Stay Small and Agile

‣Start with Interface, and build backwards.

‣Do what’s needed, and nothing that’s not.

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BE AGILE..............................................................................................................

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BE AGILE!

‣Start building right away.

‣It’s easier to throw something away, when you didn’t spend time doing it.

‣Build, Test, Gather Feedback and iterate.

‣Lower the cost of change.

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LESS IS MORE..............................................................................................................

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LESS IS MORE!

‣Don’t try to one up Competitors.

‣Solve the simple problems, and leave the rest.

‣Think ahead, and build what’s best for your users, rather than build everything.

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KEEP IT SIMPLE,..............................................................................................................

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STUPID..............................................................................................................

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KEEP IT SIMPLE, STUPID!

‣Each time you increase your code, you increase complexity exponentially.

‣Complex code => More Bugs

‣So, write Less Code, Less Features in short Keep it Simple, Stupid. (K.I.S.S )

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DON’T REPEAT YOURSELF

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Don’t Repeat Yourself

‣Reduce Duplicate Code.

‣Changing one component should not have cascading effects.

‣Modularize, Use Code Generators.

‣Single Source of Truth.

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COLLABORATE..............................................................................................................

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COLLABORATE‣Share your code. (Don’t be a jerk)

‣Take feedback from the end users during development.

‣Make sure you get the product right, before its too late.

‣Help others, and help yourself.

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GEN ‘Y’ TOOLS..............................................................................................................

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Use the Next Generation Tools‣The world no longer relies on one Language.

‣Performance, Scalability are the key.

‣Ruby on Rails (Web), WPF(Windows), Cocoa (iPhone and MacOSX)

‣MVC (Model View Controller)

‣Zero Dependency, and easy Configuration

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Ruby on Rails is astounding. Using it is like watching a kung-fu movie, where a dozen bad-ass frameworks prepare to beat up the little newcomer only to be handed their asses in a variety of imaginative ways.

“”

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Nathan Torkington, O'Reilly Program Chair for OSCON

Ruby on Rails is an open-source web framework that’s optimized for programmer happiness and sustainable productivity.

It lets you write beautiful code by favoring convention over configuration.

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80/20..............................................................................................................

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Like the 69 of the real world!

MVC..............................................................................................................

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Model View

Controller

StructuresApplication

ProvidesData

ProvidesUX and UI

A Programmer’sBest Friend

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say = “I love Ruby”puts say

=> “I love Ruby”

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say = “I love Ruby”puts say

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no “main” method

no typedeclarations.

string...

no “superfluous” keywords (“var”)

no end ofinstruction

marker

say = “I love Ruby”say[‘love’] = “*love*”puts say.upcase

=> “I *LOVE* RUBY”

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3.times { puts say }

=> “I *love* Ruby”=> “I *love* Ruby”=> “I *love* Ruby”

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[Ruby is] a dynamic, open source programming language with a focus on simplicity and productivity.

It has an elegant syntax that is natural to read and easy to write.

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TAKING THE PAIN OUT OF THINGS YOU DON’T LIKE DOING

EXPLORE..............................................................................................................

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VERSION CONTROL..............................................................................................................

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VERSION CONTROL‣One of the most overlooked features of modern development.

‣A time machine for your code.

‣Easy to setup, Zero Headaches.

‣Examples Git(Github.com), SVN, Mercurial

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DISASTERS STRIKE..............................................................................................................

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BUT DON’T CRY!..............................................................................................................

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Git to the Rescue!

‣Git is the simplest Version Control tool you’ll ever use.

‣Scales beautifully to any number of developers.

‣Online Community Support and Code repo at Github.com

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Git Magic!

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Step 1:

Step 2:

Step 3:

git init

git add .

git commit -a -m “Your Message”

Go back in Time!

git reset --hard <hash>

DATABASES..............................................................................................................

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Beyond SQL and RDBMS‣Relational Databases are hard to scale.

‣Concepts from the 1980’s, don’t work in the internet era.

‣Adopt NoSQL i.e. Not only SQL

‣No one Database fits the bill, so experiment.

‣SQL will be what COBOL is to our generation.

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Let’s take an example

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Come up with a simple database schema for Facebookto store profile information and friends.

It Probably Looks like..................................................................................................................................

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id Name DOB ....

fid1 fid2 state

Friends

Select * from Friends where fid1= ‘myid’ OR fid2= ‘myid’ AND state=1

How about this...................................................................................................................................

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A Representation of how Facebook stores Data.

Consider Twitter...

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‣Averages about 1000 tweets per second. (~1000 inserts per second)

‣Contains metadata such as Hashtags, and Mentions.

‣About 1 Billion Searches per day or 11k searches per second

The World of NoSQL

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‣Cassandra DB‣VoltDB‣MongoDB‣MemcacheDB‣Redis‣CouchDB

and many more...

READY TO JUMP?

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Let’s build an app‣We are going to build an application in Rails.

‣A Simple blog, with comments and access control.

‣Sounds complex? Should take ~15mins with Rails magic.

‣Let’s use Git for good measure.

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Final Words...

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‣Modern Software Development is fun.

‣Uncomplicate and Simplify

‣Bid Goodbye to Complex IDEs and general purpose languages like C, Java.

‣Build applications in bottom up fashion, rather than top down!

LIVE ON THE EDGE..............................................................................................................

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CODE IS POETRY..............................................................................................................

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Get the Related Resources

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kit@karthik.kastury.in

I’m available to help................................................................................................................................

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Footnotes................................................................................................................................

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All images are creative commons licensed from Flickr.

37 Signals Signals vs Noise Blog.

Agile Programming Tips

THE END..............................................................................................................

..............................................................................................................Or the start of something new.

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