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500 Lines or Less
https://github.com/aosabook/500lines

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500 Lines or Less

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README 

        
*500 Lines or Less*

===================



> "What I cannot create, I do not understand."

>

> -- Richard Feynman



This is the source for the book *500 Lines or Less*, the fourth in the

[Architecture of Open Source Applications](http://aosabook.org) series.  As

with other books in the series, all written material will be covered by the

Creative Commons - Attribution license, and all code by the MIT License: please

see the [license description](LICENSE.md) for details.  In addition, all

royalties from paid-for versions will all go to Amnesty International.



The production of this book has been made possible by the financial support of

[PagerDuty](http://www.pagerduty.com/company/work-with-us/).





    PagerDuty Logo




Mission

-------



Every architect studies family homes, apartments, schools, and other common

types of buildings during her training.  Equally, every programmer ought to

know how a compiler turns text into instructions, how a spreadsheet updates

cells, and how a database efficiently persists data.



Previous books in the AOSA series have done this by describing the high-level

architecture of several mature open-source projects. While the lessons learned

from those stories are valuable, they are sometimes difficult to absorb for

programmers who have not yet had to build anything at that scale.



"500 Lines or Less" focuses on the design decisions and tradeoffs that

experienced programmers make when they are writing code: 



*   Why divide the application into these particular modules with these

    particular interfaces?

*   Why use inheritance here and composition there?

*   How do we predict where our program might need to be extended, and how can

    we make that easy for other programmers?



Each chapter consists of a walkthrough of a program that solves a canonical

problem in software engineering in at most 500 source lines of code. We hope

that the material in this book will help readers understand the varied

approaches that engineers take when solving problems in different domains, and

will serve as a basis for projects that extend or modify the contributions

here.



Contributors

------------



  

    Name

    Affiliation

    Project

    Online

    GitHub

  

  

    Mike DiBernardo

    Wave

    editorial

    

        


    

    MichaelDiBernardo

  

   

    Amy Brown

    indie

    editorial

    

    amyrbrown

  

  

    Allison Kaptur

    Dropbox

    byterun

    

    akaptur

  

  

    Audrey Tang

    g0v.tw, Socialtext, Apple

    spreadsheet

    

        

    

    audreyt

  

  

    Brandon Rhodes

    Dropbox

    contingent

    

    brandon-rhodes

  

  

    Carl Friedrich Bolz

    King's College London

    object model

    

        

    

    cfbolz

  

  

    Cate Huston

     

    Image Filter app

    

        

    

    catehstn

  

  

    Christian Muise

    University of Melbourne

    flow-shop

    

        

    

    haz

  

  

    Daniel Jackson

     

    same-origin-policy

     

     

  

  

    Daniel Rocco

    BrightLink Technology

    contingent

    

    drocco007

  

  

    Dann Toliver

    Bento Box

    dagoba

    

        

    

    dxnn

  

  

    Dessy Daskalov

    Nudge Rewards

    Pedometer

    

        

    

    dessy

  

  

    Dethe Elza

     

    blockcode

     

    dethe

  

  

    Dustin Mitchell

    Mozilla

    cluster

     

    djmitche

  

  

    Erick Dransch

     

    Modeller

    

        

    

    EkkiD

  

  

    Eunsuk Kang

     

    same-origin-policy

     

     

  

  

    Greg Wilson

     

    web-server

    

        

    

    gvwilson

  

  

    Guido van Rossum

    Dropbox

    crawler

    

        

    

    gvanrossum

  

  

    A. Jesse Jiryu Davis

    MongoDB

    crawler

    

        

    

    ajdavis

  

  

    Jessica Hamrick

    University of California, Berkeley

    sampler

    

        

    

    jhamrick

  

  

    Leah Hanson

    Google

    static analysis

    

        

    

    astrieanna

  

  

    Leo Zovic

     

    event-web-framework

     

     

  

  

    Malini Das

    Twitch

    ci

    

        

    

    malini

  

  

    Marina Samuel

    Mozilla

    ocr

    

        

    

    emtwo

  

  

    Ned Batchelder

    edX

    templating engine

    

        

    

    nedbat

  

  

    Santiago Perez De Rosso

     

    same-origin-policy

     

     

  

  

    Taavi Burns

    Previously at Points, now at PagerDuty

    data-store

    

        

    

    taavi

  

  

    Yoav Rubin

    Microsoft

    In-memory functional database

    

        

    

    yoavrubin

  



Technical Reviewers

-------------------



  

    Amber Yust

    Andrew Gwozdziewycz

    Andrew Kuchling

  

  

    Andrew Svetlov

    Andy Shen

    Anton Beloglazov

  

  

    Ben Trofatter

    Borys Pierov

    Carise Fernandez

  

  

    Charles Stanhope

    Chris Atlee

    Chris Seaton

  

  

    Cyryl Płotnicki-Chudyk

    Dan Langer

    Dan Shapiro

  

  

    David Pokorny

    Eric Bouwers

    Frederic De Groef

  

  

    Graham Lee

    Gregory Eric Sanderson

    James O'Beirne

  

  

    Jan de Baat

    Jana Beck

    Jessica McKellar

  

  

    Jo Van Eyck

    Joel Crocker

    Johan Thelin

  

  

    Johannes Fürmann

    John Morrissey

    Joseph Kaptur

  

  

    Josh Crompton

    Joshua T. Corbin

    Kevin Huang

  

  

    Maggie Zhou

    Marc Towler

    Marcin Milewski

  

  

    Marco Lancini

    Mark Reid

    Matthias Bussonnier

  

  

    Max Mautner

    Meggin Kearney

    Mike Aquino

  

  

    Natalie Black

    Nick Presta

    Nikhil Almeida

  

  

    Nolan Prescott

    Paul Martin

    Piotr Banaszkiewicz

  

  

    Preston Holmes

    Pulkit Sethi

    Rail Aliiev

  

  

    Ronen Narkis

    Rose Ames

    Sina Jahan

  

  

    Stefan Turalski

    William Lachance