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1 PAGE NUMBER What can we learn with JavaScript Fatigue? github: lucasfcosta twitter: lfernandescosta L U C A S F C O S T A . C O M

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2 PAGE NUMBER github: lucasfcosta twitter: lfernandescosta L U C A S F C O S T A . C O M

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PAGE NUMBER 3 github: lucasfcosta twitter: lfernandescosta L U C A S F C O S T A . C O M

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PAGE NUMBER 4 github: lucasfcosta twitter: lfernandescosta L U C A S F C O S T A . C O M

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5 PAGE NUMBER github: lucasfcosta twitter: lfernandescosta L U C A S F C O S T A . C O M

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PAGE NUMBER 6 This talk is not “hardcore” github: lucasfcosta twitter: lfernandescosta L U C A S F C O S T A . C O M

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PAGE NUMBER 7 This talk is not “hardcore” •No data structures github: lucasfcosta twitter: lfernandescosta L U C A S F C O S T A . C O M

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PAGE NUMBER 8 This talk is not “hardcore” •No data structures •No fancy algorithms github: lucasfcosta twitter: lfernandescosta L U C A S F C O S T A . C O M

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PAGE NUMBER 9 This talk is not “hardcore” •No data structures •No fancy algorithms •No math github: lucasfcosta twitter: lfernandescosta L U C A S F C O S T A . C O M

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PAGE NUMBER 10 = github: lucasfcosta twitter: lfernandescosta L U C A S F C O S T A . C O M This talk is about making decisions.

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PAGE NUMBER 11 LUCASFCOSTA.COM

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PAGE NUMBER 12 Realities of your industry 101

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PAGE NUMBER REALITIES OF YOUR INDUSTRY 101 13 LUCASFCOSTA.COM Software solves business problems Don't Call Yourself A Programmer, And Other Career Advice - Patrick McKenzie

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REALITIES OF YOUR INDUSTRY 101 PAGE NUMBER LUCASFCOSTA.COM 14 You are not paid to write code The less code you write, the better

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PAGE NUMBER 15 You’re in the business of unemploying people. Patrick McKenzie REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER LUCASFCOSTA.COM REALITIES OF YOUR INDUSTRY 101 16 Technology is not a goal

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PAGE NUMBER LUCASFCOSTA.COM 17 REALITIES OF YOUR INDUSTRY 101 versus Revenue Cost All that matters™

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PAGE NUMBER LUCASFCOSTA.COM REALITIES OF YOUR INDUSTRY 101 18

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PAGE NUMBER 19 Realities of your industry 101 REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER 20 Realities of your industry 101 REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER 21 Realities of capitalism 101 REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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22 PAGE NUMBER 64% 36% Coding Design Some Experience With Automated Aids To The Design Of Large-Scale Reliable Software - 1975 Occurrence of Errors REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER LUCASFCOSTA.COM 23 REALITIES OF YOUR INDUSTRY 101 In the NASA Apollo project about 73% of all errors were design errors. HAMILTON, M., AND ZELDIN, S. "Higher order software--a methodology for defining software,"

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24 PAGE NUMBER “ Louis Srygley Without requirements or design, programming is the art of adding bugs to an empty text file. REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER LUCASFCOSTA.COM REALITIES OF YOUR INDUSTRY 101 25 JS These things exist to solve problems.

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PAGE NUMBER 26 JS Fatigue happens when people use tools they don't need to solve problems they don't have. REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER LUCASFCOSTA.COM REALITIES OF YOUR INDUSTRY 101 Donald Knuth “ 27 "Premature optimization is the root of all evil"

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PAGE NUMBER 28 REALITIES OF YOUR INDUSTRY 101 The greatest performance improvement of all is when a system goes from not-working to working John Ousterhout

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PAGE NUMBER 29 Fancy algorithms are slow when n is small and n is usually small. Rob Pike REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER LUCASFCOSTA.COM REALITIES OF YOUR INDUSTRY 101 30 Remember this?

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PAGE NUMBER LUCASFCOSTA.COM 31 REALITIES OF YOUR INDUSTRY 101 analysis paralysis

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PAGE NUMBER LUCASFCOSTA.COM 32 REALITIES OF YOUR INDUSTRY 101 analysis paralysis

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PAGE NUMBER 33 More choices
 Less satisfaction REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER 34 As the number of options increases, the costs, in time and effort, of gathering the information needed to make a good choice also increase Barry Schwartz REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER 35 Have you ever wondered why surprise box subscriptions are so popular nowadays? REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER 36 Our willpower is limited REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER LUCASFCOSTA.COM 37 REALITIES OF YOUR INDUSTRY 101 Creative Slides Presentation Your willpower is like a muscle Judges would make more favorable decisions after those breaks. After a lunch break the rates of favorable decisions immediately jumps to 65% again. Dotted lines represent food breaks In the morning we started with 65% of favorable decisions and at the end of the day this rate steadily drops to zero. As time goes by, less favorable decisions occur James Clear Image by James Clear

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PAGE NUMBER 38 We might not be JavaScript fatigued maybe we’re just decision fatigued REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER 39 JavaScript REALITIES OF YOUR INDUSTRY 101 LUCASFCOSTA.COM

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PAGE NUMBER 40 A bunch of impressive numbers™ LUCASFCOSTA.COM JAVASCRIPT

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PAGE NUMBER LUCASFCOSTA.COM JAVASCRIPT 41 packages on

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PAGE NUMBER LUCASFCOSTA.COM JAVASCRIPT 42 520,121 packages on

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PAGE NUMBER LUCASFCOSTA.COM JAVASCRIPT 43 ~494 packages a day

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PAGE NUMBER LUCASFCOSTA.COM JAVASCRIPT 44 400 a month Birth Rate in Florianópolis

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PAGE NUMBER 45 LUCASFCOSTA.COM JAVASCRIPT

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PAGE NUMBER 46 ? But how did that happen? JAVASCRIPT LUCASFCOSTA.COM

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JAVASCRIPT PAGE NUMBER 47 The History Of JavaScript LUCASFCOSTA.COM

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PAGE NUMBER 48 1992 THE JOURNEY BEGINS A company called Nombas started creating a language called C-minus-minus (CMM) 1. As the popularity of Netscape grew, they developed a version that could be embedded into webpages (“Espresso Pages”) 2. Cmm was renamed to ScriptEase JAVASCRIPT LUCASFCOSTA.COM

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PAGE NUMBER 49 1995 A WILD JAVASCRIPT APPEARED JavaScript was created in 10 days 1. It aimed to handle input validation on the client-save and save round-trips 2. Since then, JavaScript became a must-have 3. JAVASCRIPT LUCASFCOSTA.COM

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PAGE NUMBER 50 1995 THINGS GET COMPLICATED Microsoft releases Internet Explorer 3.0 with JScript 1. We now have 3 different scripting languages available: 2. ScriptEase JavaScript JScript JAVASCRIPT LUCASFCOSTA.COM

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PAGE NUMBER 51 1997 FINALLY WE GET A STANDARD A proposal was submitted to ECMA 1. Technical Committee #39 (TC39) was assigned for: 2. Standardization of the general purpose, cross platform, vendor- neutral programming language ECMAScript. JAVASCRIPT LUCASFCOSTA.COM

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PAGE NUMBER 52 ECMAScript then became the basis for all JavaScript implementations JAVASCRIPT LUCASFCOSTA.COM LUCASFCOSTA.COM

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PAGE NUMBER 53 ES1 1997 ES2 1998 ES3 1999 ES4 2008 (CANCELLED) ES5 2009 ES6 2015 JAVASCRIPT LUCASFCOSTA.COM

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PAGE NUMBER JAVASCRIPT 54 14.88% Safari 54.89% Chrome 5.9% Firefox 4% Opera 7.43% UC Browser 3.69% IE Browser Market Share source: http://gs.statcounter.com/browser-market-share LUCASFCOSTA.COM

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JAVASCRIPT PAGE NUMBER LUCASFCOSTA.COM 55 Transpilers

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JAVASCRIPT PAGE NUMBER LUCASFCOSTA.COM 56 Module Bundlers

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JAVASCRIPT PAGE NUMBER LUCASFCOSTA.COM 57 Front-end Frameworks

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PAGE NUMBER “ 58 Abstractions are necessary to reduce the cognitive load of how things work so you can focus on creating. Eric Clemmons LUCASFCOSTA.COM JAVASCRIPT

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PAGE NUMBER 59 First you learn the value of abstraction, then you learn the cost of abstraction, then you're ready to engineer Kent Beck LUCASFCOSTA.COM JAVASCRIPT

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PAGE NUMBER 60 The web platform moves too fast LUCASFCOSTA.COM JAVASCRIPT

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PAGE NUMBER 61 More tools mean more choices LUCASFCOSTA.COM JAVASCRIPT

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PAGE NUMBER 62 Natural Selection LUCASFCOSTA.COM JAVASCRIPT

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PAGE NUMBER JAVASCRIPT LUCASFCOSTA.COM 63 Good programmers know what to write. Eric. S. Raymond Great ones know what to rewrite (and reuse).

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PAGE NUMBER 64 The Unix Philosophy JAVASCRIPT LUCASFCOSTA.COM

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PAGE NUMBER LUCASFCOSTA.COM 65 JAVASCRIPT Do one thing, and do it well.

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PAGE NUMBER LUCASFCOSTA.COM 66 Do one thing, and do it well. JAVASCRIPT

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PAGE NUMBER LUCASFCOSTA.COM 67 JAVASCRIPT Write programs that work together.

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M A R K 0 3 P R E S E N T A T I O N PAGE NUMBER 68 Our tools are not new LUCASFCOSTA.COM

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PAGE NUMBER 69 These things are not new LUCASFCOSTA.COM JAVASCRIPT

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PAGE NUMBER 70 These things are not new LUCASFCOSTA.COM JAVASCRIPT E4X JSX

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PAGE NUMBER 71 These things are not new LUCASFCOSTA.COM JAVASCRIPT

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PAGE NUMBER 72 These things are not new grunt npm webpack LUCASFCOSTA.COM JAVASCRIPT

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PAGE NUMBER 73 These things are not new LUCASFCOSTA.COM JAVASCRIPT Symbian
 WRT

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PAGE NUMBER 74 How to deal with it

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PAGE NUMBER LUCASFCOSTA.COM 75 HOW TO DEAL WITH IT you don’t need to know everything

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PAGE NUMBER LUCASFCOSTA.COM 76 HOW TO DEAL WITH IT don’t be defined by your stack

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PAGE NUMBER LUCASFCOSTA.COM 77 HOW TO DEAL WITH IT Master Foo & The Recruiter

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PAGE NUMBER LUCASFCOSTA.COM 78 HOW TO DEAL WITH IT A technical recruiter, having discovered that that the ways of Unix hackers were strange to him, sought an audience with Master Foo to learn more about the Way.

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PAGE NUMBER LUCASFCOSTA.COM 79 HOW TO DEAL WITH IT The recruiter said:
 “I have observed that Unix hackers scowl or become annoyed when I ask them how many years of experience they have in a new programming language. Why is this so?”

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PAGE NUMBER LUCASFCOSTA.COM 80 HOW TO DEAL WITH IT Master Foo stood, and began to pace across the office floor. The recruiter was puzzled, and asked “What are you doing?”

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PAGE NUMBER LUCASFCOSTA.COM 81 HOW TO DEAL WITH IT “I am learning to walk,” replied Master Foo.

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PAGE NUMBER LUCASFCOSTA.COM 82 HOW TO DEAL WITH IT “I saw you walk through that door” the recruiter exclaimed “and you are not stumbling over your own feet. Obviously you already know how to walk.”

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PAGE NUMBER LUCASFCOSTA.COM 83 HOW TO DEAL WITH IT “Yes, but this floor is new to me.” replied Master Foo. Upon hearing this, the recruiter was enlightened. http://www.catb.org/esr/writings/unix-koans/recruiter.html

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PAGE NUMBER 84 start from the beginning HTTP CompSci
 Fundamentals HOW TO DEAL WITH IT LUCASFCOSTA.COM

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PAGE NUMBER LUCASFCOSTA.COM 85 HOW TO DEAL WITH IT don’t be too attached to a single technology

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PAGE NUMBER LUCASFCOSTA.COM 86 HOW TO DEAL WITH IT dig deep

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PAGE NUMBER LUCASFCOSTA.COM 87 HOW TO DEAL WITH IT What I cannot create I do not understand. Richard Feynman

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PAGE NUMBER LUCASFCOSTA.COM 88 HOW TO DEAL WITH IT focus on what matters

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PAGE NUMBER LUCASFCOSTA.COM 89 HOW TO DEAL WITH IT Parkinson's law of triviality Members of an organization give disproportionate weights to trivial issues.

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PAGE NUMBER LUCASFCOSTA.COM 90 HOW TO DEAL WITH IT a.k.a. bikeshedding

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PAGE NUMBER LUCASFCOSTA.COM 91 HOW TO DEAL WITH IT don’t get ahead of yourself

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PAGE NUMBER LUCASFCOSTA.COM 92 HOW TO DEAL WITH IT do things that don’t scale Paul Graham

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PAGE NUMBER 93 The Master Plan Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT

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PAGE NUMBER 94 The Master Plan Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT . Create a low volume car, which would necessarily be expensive

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PAGE NUMBER 95 The Master Plan Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT . Create a low volume car, which would necessarily be expensive . Use that money to develop a medium volume car at a lower price

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PAGE NUMBER 96 The Master Plan Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT . Create a low volume car, which would necessarily be expensive . Use that money to develop a medium volume car at a lower price . Use that money to create an affordable, high volume car

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PAGE NUMBER 97 The Master Plan Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT . Create a low volume car, which would necessarily be expensive . Use that money to develop a medium volume car at a lower price . Use that money to create an affordable, high volume car . Provide solar power.

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PAGE NUMBER 98 The Master Plan Tesla Roadster Tesla Model 3 Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT

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PAGE NUMBER 99 The Master Plan Tesla Roadster Tesla Model 3 Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT $ ~110,000 $ ~35,000

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PAGE NUMBER 100 The Master Plan Tesla Roadster Tesla Model 3 Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT $ ~110,000 $ ~35,000 2,400 units sold 200,000 units reserved

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PAGE NUMBER 101 The Master Plan Tesla Roadster Tesla Model 3 Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT $ ~110,000 $ ~35,000 2,400 units sold 200,000 units reserved ON ITS FIRST DAY

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PAGE NUMBER 102 The Master Plan Tesla Roadster Tesla Model 3 Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT $ ~110,000 $ ~35,000 2,400 units sold 200,000 units reserved ON ITS FIRST DAY BEFORE RELEASE

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PAGE NUMBER 103 The Master Plan Thanks Mr. Elon Musk, you are awesome LUCASFCOSTA.COM HOW TO DEAL WITH IT “Okay, but what about solar power?"

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PAGE NUMBER LUCASFCOSTA.COM 104 HOW TO DEAL WITH IT Henrik Kniberg

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PAGE NUMBER LUCASFCOSTA.COM 105 HOW TO DEAL WITH IT Henrik Kniberg

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PAGE NUMBER LUCASFCOSTA.COM 106 HOW TO DEAL WITH IT Henrik Kniberg meh, that’s cliché

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PAGE NUMBER LUCASFCOSTA.COM 107 the cathedral the bazaar HOW TO DEAL WITH IT

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PAGE NUMBER LUCASFCOSTA.COM 108 the cathedral HOW TO DEAL WITH IT • centralized • carefully crafted by individual wizards • no beta or release before its time

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PAGE NUMBER LUCASFCOSTA.COM 109 HOW TO DEAL WITH IT • centralized • carefully crafted by individual wizards • no beta or release before its time the bazaar • release early and often • delegate everything you can • communicate • listen to feedback

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PAGE NUMBER 110 The Right Thing Worse is better LUCASFCOSTA.COM HOW TO DEAL WITH IT SIMPLICITY

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PAGE NUMBER 111 The Right Thing Worse is better LUCASFCOSTA.COM HOW TO DEAL WITH IT • It is more important for the interface to be simple than the implementation. • The design must be simple, both in implementation and interface. Simplicity is the most important consideration in a design. SIMPLICITY

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PAGE NUMBER 112 The Right Thing Worse is better LUCASFCOSTA.COM HOW TO DEAL WITH IT • It is more important for the interface to be simple than the implementation. • Incorrectness is simply not allowed • The design must be simple, both in implementation and interface. Simplicity is the most important consideration in a design. • It is slightly better to be simple than correct. CORRECTNESS

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PAGE NUMBER 113 The Right Thing Worse is better LUCASFCOSTA.COM HOW TO DEAL WITH IT • It is more important for the interface to be simple than the implementation. • Incorrectness is simply not allowed • The design must be consistent. A design is allowed to be slightly less simple and less complete to avoid inconsistency. • The design must be simple, both in implementation and interface. Simplicity is the most important consideration in a design. • It is slightly better to be simple than correct. • The design must not be overly inconsistent. Consistency can be sacrificed for simplicity in some cases. CONSISTENCY

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PAGE NUMBER 114 The Right Thing Worse is better LUCASFCOSTA.COM HOW TO DEAL WITH IT • It is more important for the interface to be simple than the implementation. • Incorrectness is simply not allowed • The design must be consistent. A design is allowed to be slightly less simple and less complete to avoid inconsistency. • The design must cover as many important situations as is practical. Simplicity is not allowed to overly reduce completeness. • The design must be simple, both in implementation and interface. Simplicity is the most important consideration in a design. • It is slightly better to be simple than correct. • The design must not be overly inconsistent. Consistency can be sacrificed for simplicity in some cases. • Completeness can be sacrificed in favor of any other quality. In fact, completeness must be sacrificed whenever implementation simplicity is jeopardized. COMPLETENESS

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PAGE NUMBER 115 The Right Thing Worse is better LUCASFCOSTA.COM HOW TO DEAL WITH IT Might take forever to build • The design must be simple, both in implementation and interface. Simplicity is the most important consideration in a design. • It is slightly better to be simple than correct. • The design must not be overly inconsistent. Consistency can be sacrificed for simplicity in some cases. • Completeness can be sacrificed in favor of any other quality. In fact, completeness must be sacrificed whenever implementation simplicity is jeopardized. COMPLETENESS

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116 PAGE NUMBER What am I? Programmer or Software Developer? Software Architect? Software Engineer? HOW TO DEAL WITH IT

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PAGE NUMBER LUCASFCOSTA.COM 117 engineering software development HOW TO DEAL WITH IT

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PAGE NUMBER 118 This is Barcelona. LUCASFCOSTA.COM HOW TO DEAL WITH IT

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PAGE NUMBER 119 This is Barcelona as seen from the sky. LUCASFCOSTA.COM HOW TO DEAL WITH IT

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PAGE NUMBER 120 Be a town planner LUCASFCOSTA.COM HOW TO DEAL WITH IT

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PAGE NUMBER 121 Software is flexible. Engineering is not. HOW TO DEAL WITH IT

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122 PAGE NUMBER We can break things We spend more time designing and thinking than building We can build as many times as we want We can always change things Our build time is compile time. HOW TO DEAL WITH IT

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PAGE NUMBER 123 LET IT GROW ADAPT AS NEEDED Be a town planner. LUCASFCOSTA.COM HOW TO DEAL WITH IT

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PAGE NUMBER LUCASFCOSTA.COM HOW TO DEAL WITH IT “ 124 Abstractions only work well in the right context, and the right context develops as the system develops. Sam Koblenski

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PAGE NUMBER LUCASFCOSTA.COM 125 HOW TO DEAL WITH IT strive to be lazy

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PAGE NUMBER LUCASFCOSTA.COM 126 HOW TO DEAL WITH IT talk to people

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PAGE NUMBER LUCASFCOSTA.COM 127 HOW TO DEAL WITH IT Be curious. Read widely. Try new things. What people call intelligence just boils down to curiosity. Aaron Swartz

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PAGE NUMBER LUCASFCOSTA.COM 128 HOW TO DEAL WITH IT solve problems

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PAGE NUMBER LUCASFCOSTA.COM 129 solve problems thank you L U C A S F C O S T A . C O M github: lucasfcosta twitter: lfernandescosta

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130 PAGE NUMBER Related Material/References THANK YOU! • Don't Call Yourself A Programmer, And Other Career Advice (Highly Recommended)
 Patrick McKenzie
 http://www.kalzumeus.com/2011/10/28/dont-call-yourself-a-programmer/ • The Cost of Abstraction
 Sam Koblenski
 http://sam-koblenski.blogspot.com/2014/07/the-cost-of-abstraction.html • The Deep Roots of Javascript Fatigue
 Calvin French-Owen
 https://segment.com/blog/the-deep-roots-of-js-fatigue/ • JavaScript Fatigue
 Eric Clemmons
 https://medium.com/@ericclemmons/javascript-fatigue-48d4011b6fc4 • JavaScript Fatigue Fatigue - Dr. Axel Rauschmayer
 http://2ality.com/2016/02/js-fatigue-fatigue.html • JavaScript Fatigue, AMP, and Paths.js - JS Party Episode #3
 https://changelog.com/jsparty/3 Building Microservices (Book)
 Sam Newman