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Hello

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my name is Yukihiro Matsumoto
also known as Matz

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it's nice to see a bigger crowd this year

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in our first year in 2001 
we had only 33 or so

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and last year, maybe 50

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Why are we here ?

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we are here because Ruby is good enough for many of our tasks

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so we do not have to talk about that

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so I'm going to talk about
How Ruby Sucks

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and how we can make it better

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...

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for exemple, it's slow and inconsistent

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how can we fix these

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with a major version change from 1.0 to 2.0

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this is the opportunity to take one big step

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and make big changes which may not be 
backward-compatible

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but will make Ruby better

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to clarify, Ruby 2 is the next version of the Ruby language
and Rite is the VM for Ruby 2

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the path we will take through Ruby 2

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...

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...

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then in 1.9 we will work on the syntax changes

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I do not know what these changes will be yet

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but there will be experiments

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...

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...

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...

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...

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...

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thank you.

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()

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() sorry.

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()

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OK!

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Here we are.

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The first thing we do is called the rails command

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to generate the skeleton of the application

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so it generates a bunch of things,
a bunch of files

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and on the next step, the very next step

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it's starting the ruby server

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so, seeing that everything works

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you don't need prerequisites to this

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except? that you have Ruby on Rails installed

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(oh no!)

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() sorry guys...

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(laughs)

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OK!

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we're going to do this again

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(laughs)

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(more laughs)

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anyway, ...

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bye!

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[_why]

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to command? in Ruby

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is really to learn

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it stirs you inside

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when I walk down the street and look into
people's eyes

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I can see their excitement about learning Rails

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you know?

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I can see that they know 
David Heinemeier Hansson

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that they want to be him

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that they want his ???
and his ways

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there's rushing out the streets to get here

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...and that's pretty cool

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(laughs)

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so one of the way I've been messing with Ruby
is with cartoons and stuff

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and there's a science behind this,
it's incredibly thought out

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I mean, wow...
foxes, you know

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of all animals

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these are the foxes that I use in the book
I'm working on

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and

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...

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...

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...

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...

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is there personality there ?
is there feeling ?

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Is there humanism ?

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Is there humanity in a technical manual ?

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Not really.
there shouldn't be.

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Their eyes should be blank, they shouldn't be staring

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this is the one I like

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...

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...

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and that's supposed to be sort of frustrating

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..

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...

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...

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[Bryan Liles]

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Me, I'm going to talk about BDD with RSpec

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but I like to test things around

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so let's just talk about BDD

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or really, let's just talk about testing 
for us normal people

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and the real thing I'm trying to get out to 
everyone here is that

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Test all the fucking time

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(laughs)

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so the bible says, "in the beginning"

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and in the beginning there was, what ?

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There was Perl !
(laughs)

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Perl is what I knew

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... Perl ... Java ?

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..

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...

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so then, a couple of years ago

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there was this little Danish guy

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he looks like a cartoon character

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came up with something call Ruby on Rails

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and I can't use the logo, 'cause he says I can't

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so, with Ruby on Rails

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...

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and I was still writing bad tests

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..

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...

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some smart guys came up with RSpec

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...

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wow, this is hot

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but I'm still writing brittle tests, with funky syntax

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and it wasn't helping anyone

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(laughs)

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so I decided I wasn't ready to give up with RSpec

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and I studied, and studied, and studied

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...

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...

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I don't care if it hurts

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write the tests first

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...

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...

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test all the fucking time

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(laughs)

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[Aaron Patterson]

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O-M-G
O-M-G

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Happy thursday everybody!

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(laughs)

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Welcome to RubyConf 10

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I love that it's Rubyconf X

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because I think of it as the eXtreme RubyConf

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(laughs)

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...?

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every time I give a talk, I'm actually very nervous
up here

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and a friend a mine told me:
when you're upstage, just think

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what would Freddy Mercury do ?

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so I put this up here to remind myself 
about that, to calm down

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so, today we're going to look at 
some tips and tricks

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for improving performance in your Ruby code

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by looking at things...?

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to improve the performance of ARel

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so how did I get started with this?

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there's a feature I wanted to add to Rails 
for a very long time

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and that is prepared statement caching

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...

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...

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a deeper understanding of ActiveRecord was required

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...

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...

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and fixing bugs in ActiveRecord

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...

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...

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and I thought to myself, 
five times slower?

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really, five times slower?

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how is that possible?
(laughs)

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it is possible
it really was five times slower

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...

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and I thought
what could possibly go wrong?

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so, motivation

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why do we care about speed?

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...

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...

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...

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...

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...

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...

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it's very simple,
like this

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(laughs)

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...

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...

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...?

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really, I'm just trolling you

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...

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...

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When should I make my code faster?
We need the answer to this

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When it isn't fast enough

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but then the question is :
what is fast enough?

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Whenever I think about this, I think:
well, do people notice it?

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and what are you comparing it to?

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...

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...

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and that is subjective

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and really, I'm telling you all these things

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but I don't want you to believe it

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I want you to think critically

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and go out and look at this stuff
and analyse it for yourself

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...

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...

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method calls, branching and looping

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and you need to reduce objects

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what I think is interesting, is that
for clean code

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the things to reduce, are exactly the same

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therefore

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clean code equals performant code

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(laughs)

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...in conclusion

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AKA the things I've learned

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system impact

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...

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...

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...

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...

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I learned,
when should I rewrite?

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I see it like this

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the earliest you should rewrite is when Ryan Davis says so

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and the latest you should rewrite is when I say so

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(laughs)

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...

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[Sandi Metz]

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...?

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...

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brace yourself, because some of it is hard

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everything will change

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everything.

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...

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...

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...

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I know this is your future
because it is my task

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...

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...

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...

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...

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...

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...

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the Internet is at the center of our lives

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..

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...

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...

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...

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...

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...

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...

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...

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so there you go,
that's your future

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...

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those, unfortunately, are edge cases

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this is your real fortune

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...

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...

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...

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...

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...

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...

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...

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...

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...

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you wouldn't ignore the inevitable

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you'll be writing code for this right now

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(laughs)

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accepting the truth of this fortune
makes it clear what's important

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the MVPs ...?

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...

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...

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...

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happiness

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live as if you'll know you'll die

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do. real. things

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tell everyone you love them.
today

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you might consider getting a little dog
(laughs)

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Health

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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as a community

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...

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...

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...

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showing up in small ways makes a big difference

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...

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we're bigger than Rails and we're bigger than Ruby

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...

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...

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...

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from scrolls to codexes
all the way to composing drums

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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325
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...

326
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...

327
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...

328
99:59:59,999 --> 99:59:59,999
just a second, technical difficulties
(laughs)

329
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330
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331
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332
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333
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341
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342
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(applause)

343
99:59:59,999 --> 99:59:59,999
[Jim Weirich]

344
99:59:59,999 --> 99:59:59,999
...

345
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...

346
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...

347
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...

348
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...

349
99:59:59,999 --> 99:59:59,999
...

350
99:59:59,999 --> 99:59:59,999
these things to mind

351
99:59:59,999 --> 99:59:59,999
so I try not to use that word

352
99:59:59,999 --> 99:59:59,999
so we're trying to talk instead about 
flying robots

353
99:59:59,999 --> 99:59:59,999
...

354
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...

355
99:59:59,999 --> 99:59:59,999
...

356
99:59:59,999 --> 99:59:59,999
...

357
99:59:59,999 --> 99:59:59,999
(laughs)

358
99:59:59,999 --> 99:59:59,999
..

359
99:59:59,999 --> 99:59:59,999
....

360
99:59:59,999 --> 99:59:59,999
...

361
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...

362
99:59:59,999 --> 99:59:59,999
...

363
99:59:59,999 --> 99:59:59,999
(drone flying)

364
99:59:59,999 --> 99:59:59,999
so that was the argus library
controlling the drone

365
99:59:59,999 --> 99:59:59,999
and totally not Carol's arm
(laughs)

366
99:59:59,999 --> 99:59:59,999
ok so here's another program,
I'm going to have it take off

367
99:59:59,999 --> 99:59:59,999
using a loop two times,
and making a sweep back and forth

368
99:59:59,999 --> 99:59:59,999
(drone flying)
Take off...

369
99:59:59,999 --> 99:59:59,999
loopy times,
swing back and forth

370
99:59:59,999 --> 99:59:59,999
and land.

371
99:59:59,999 --> 99:59:59,999
How about that !
two successful hardware demos !

372
99:59:59,999 --> 99:59:59,999
(laughs)

373
99:59:59,999 --> 99:59:59,999
(more laughs)

374
99:59:59,999 --> 99:59:59,999
oh who cares...

375
99:59:59,999 --> 99:59:59,999
[Carol] Jeremy,
Jeremy, Jeremy, Jeremy, Jeremy

376
99:59:59,999 --> 99:59:59,999
[Jeremy] hold on, putting my clothes on

377
99:59:59,999 --> 99:59:59,999
What?

378
99:59:59,999 --> 99:59:59,999
Did you hear about this new conference
Keep Ruby Weird?

379
99:59:59,999 --> 99:59:59,999
yeah, I've heard all about it
it sound fun!

380
99:59:59,999 --> 99:59:59,999
OMG, we should submit something!

381
99:59:59,999 --> 99:59:59,999
well, what do we like?

382
99:59:59,999 --> 99:59:59,999
hmm... Conferences!
[Jeremy] Conferences!

383
99:59:59,999 --> 99:59:59,999
(laughs)

384
99:59:59,999 --> 99:59:59,999
but, how do we make that weird?

385
99:59:59,999 --> 99:59:59,999
[Brenna] Puppets!
[All] Puppets!

386
99:59:59,999 --> 99:59:59,999
but, do you think people will like it?

387
99:59:59,999 --> 99:59:59,999
(applause)

388
99:59:59,999 --> 99:59:59,999
alright I'm gonna stand up here for a second

389
99:59:59,999 --> 99:59:59,999
there's this mic hanging around

390
99:59:59,999 --> 99:59:59,999
so, a lot went wrong there

391
99:59:59,999 --> 99:59:59,999
(laughs)

392
99:59:59,999 --> 99:59:59,999
but I don't think anybody had more fun

393
99:59:59,999 --> 99:59:59,999
than we did it

394
99:59:59,999 --> 99:59:59,999
so I am up here on a stage, holding a puppet of myself

395
99:59:59,999 --> 99:59:59,999
it's even wearing my earrings

396
99:59:59,999 --> 99:59:59,999
I'm up here with two of my favorites people
who are still hiding down here

397
99:59:59,999 --> 99:59:59,999
who are also holding puppets of themselves

398
99:59:59,999 --> 99:59:59,999
but this is a amazing moment
and we are so grateful to everyone

399
99:59:59,999 --> 99:59:59,999
that's made it possible

400
99:59:59,999 --> 99:59:59,999
It's actually you, Brenna
that made this happen

401
99:59:59,999 --> 99:59:59,999
for every hour of work I put it
she put in three

402
99:59:59,999 --> 99:59:59,999
so please, everyone, 
some thunderous applause

403
99:59:59,999 --> 99:59:59,999
(thunderous applause)

404
99:59:59,999 --> 99:59:59,999
sharing moments with people
is why we did this

405
99:59:59,999 --> 99:59:59,999
some like this one are amazing

406
99:59:59,999 --> 99:59:59,999
and most other are ordinary

407
99:59:59,999 --> 99:59:59,999
...?

408
99:59:59,999 --> 99:59:59,999
maybe those ordinary ones are pretty good

409
99:59:59,999 --> 99:59:59,999
this is a sandy? set, we're doing real things

410
99:59:59,999 --> 99:59:59,999
and it'll keep us coming back

411
99:59:59,999 --> 99:59:59,999
to the keyboard and the frustration

412
99:59:59,999 --> 99:59:59,999
and the endless planning meetings

413
99:59:59,999 --> 99:59:59,999
and the ever-changing tech landscape

414
99:59:59,999 --> 99:59:59,999
Node? will kill me

415
99:59:59,999 --> 99:59:59,999
Jim Weirich passed away early this year,
as everybody knows

416
99:59:59,999 --> 99:59:59,999
and, through putting on Steel City Ruby

417
99:59:59,999 --> 99:59:59,999
with Carol and a bunch of other people
in Pittsburgh

418
99:59:59,999 --> 99:59:59,999
I got some time with Jim that I wouldn't had otherwise

419
99:59:59,999 --> 99:59:59,999
we shared a meal or two

420
99:59:59,999 --> 99:59:59,999
we shared some jokes,

421
99:59:59,999 --> 99:59:59,999
and one time we shared a song
Jim loved to play the ukulele

422
99:59:59,999 --> 99:59:59,999
that was a pretty cool moment
in the hallway outside Steel City Ruby

423
99:59:59,999 --> 99:59:59,999
three years ago

424
99:59:59,999 --> 99:59:59,999
there's a lot we didn't share though

425
99:59:59,999 --> 99:59:59,999
we didn't share code

426
99:59:59,999 --> 99:59:59,999
we never shared ideas about code or 
the projects we were working on

427
99:59:59,999 --> 99:59:59,999
we never share a long cab ride 
into a airport

428
99:59:59,999 --> 99:59:59,999
or favorites places to get brunch

429
99:59:59,999 --> 99:59:59,999
I never got to share all the weird shit I made with Rake

430
99:59:59,999 --> 99:59:59,999
I guess what we're trying to say up here
is that

431
99:59:59,999 --> 99:59:59,999
we want to share those moments with you

432
99:59:59,999 --> 99:59:59,999
we don't want to miss another opportunity 
to let someone know the impact

433
99:59:59,999 --> 99:59:59,999
they'd have on our lives

434
99:59:59,999 --> 99:59:59,999
maybe making a puppet that looks kinda like 
Aaron Patterson

435
99:59:59,999 --> 99:59:59,999
is a weird way to do it
but,

436
99:59:59,999 --> 99:59:59,999
we're standing on the shoulder of giants

437
99:59:59,999 --> 99:59:59,999
and many of them were pretty weird

438
99:59:59,999 --> 99:59:59,999
so thank you again

439
99:59:59,999 --> 99:59:59,999
for giving us a place to hang our hats

440
99:59:59,999 --> 99:59:59,999
thank you for keeping your weird

441
99:59:59,999 --> 99:59:59,999
thank you for optimizing for developer happiness

442
99:59:59,999 --> 99:59:59,999
and for being nice because
Matz is nice

443
99:59:59,999 --> 99:59:59,999
thank you for all the pictures of weird cats

444
99:59:59,999 --> 99:59:59,999
thank you for all the terrible puns

445
99:59:59,999 --> 99:59:59,999
and thank you, again, for never forgetting
to test all the fucking time

446
99:59:59,999 --> 99:59:59,999
(applause)