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Billion-Dollar
Mistakes
Tony Hoare
and
Android Burritos
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Android has
Good Parts
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Android has
Good Parts
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Focus on
$PEOPLE
not on
$TECH
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Focus on
$PRODUCT
not on
$TECH
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TODAY…
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TODAY…
1. Why it’s good to own
your mistakes
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TODAY…
1. Why it’s good to own
your mistakes
2. Why I care deeply about
documentation
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TODAY…
1. Why it’s good to own
your mistakes
2. Why I care deeply about
documentation
3. Why I really don’t like
Android Burritos
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“I call it my billion-dollar mistake.”
Tony Hoare (2009)
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It was the invention of the null reference in 1965.
At that time, I was designing the first comprehensive type system
for references in an object oriented language
My goal was to ensure that all use
of references should be absolutely safe,
with checking performed automatically by the compiler.
But I couldn't resist the temptation to put in a null reference,
simply because it was so easy to implement.
This has led to innumerable errors,
vulnerabilities, and system crashes,
which have probably caused a billion dollars
of pain and damage in the last forty years.
“I call it my billion-dollar mistake.”
Tony Hoare (2009)
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Who is Tony Hoare?
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Who is Tony Hoare?
Quicksort
Quickselect
Communication
Sequential Processes
Sctructured
Programming
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Who is Tony Hoare?
Turing Award
Goode Memorial Award
Faraday Medal
Computer Pioneer Award
Kyoto Prize
IEE Neumann Medal
Quicksort
Quickselect
Communication
Sequential Processes
Sctructured
Programming
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Who is Tony Hoare?
Turing Award
Goode Memorial Award
Faraday Medal
Computer Pioneer Award
Kyoto Prize
IEE Neumann Medal
Quicksort
Quickselect
Communication
Sequential Processes
Sctructured
Programming
Billion
Dollar
Mistake
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Maths
Google, Amazon, Apple,
Facebook, Microsoft are
worth $500-$1000 billion
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There is always
a good reason
to do nothing
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There is always
a good reason
to do nothing
"We were after the C++ programmers.”
“We managed to drag a lot of them about halfway to Lisp.”
Guy Steele, co-author of the Java spec
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The Tony Hoare effect
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The Tony Hoare effect
Before: C, C++,
Java, JavaScript, …
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The Tony Hoare effect
Before: C, C++,
Java, JavaScript, …
After: Kotlin, Swift,
TypeScript, @Java, …
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Why I care deeply
about good
documentation?
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“Lernen durch Schmerzen”
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“Lernen durch Schmerzen”
Junior developer
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“Lernen durch Schmerzen”
Junior developer
Android is cool
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“Lernen durch Schmerzen”
Junior developer
Android is cool
RTFM
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“Lernen durch Schmerzen”
Junior developer
Android is cool
RTFM
Not enligthened
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“Lernen durch Schmerzen”
Junior developer
Android is cool
RTFM
Not enligthened
Smelling code
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“Lernen durch Schmerzen”
Junior developer
Android is cool
RTFM
Not enligthened
Smelling code
Slow ⏳
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“Lernen durch Schmerzen”
Junior developer
Android is cool
RTFM
Not enligthened
Smelling code
Slow ⏳
Crashes
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“Lernen durch Schmerzen”
Junior developer
Android is cool
RTFM
Not enligthened
Smelling code
Slow ⏳
Crashes
I can’t write tests
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“Lernen durch Schmerzen”
Junior developer
Android is cool
RTFM
Not enligthened
Smelling code
Slow ⏳
Crashes
I can’t write tests
It must be me
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A turning point
The price of ENUMs
#PERFMATTERS
https://www.youtube.com/watch?v=Hzs6OBcvNQE
We implemented Enums badly
Let’s pass the buck to app developers
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AHA
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Everyone is
writing
crappy code
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Do as I say,
Not as I do
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Read
The
Friendly
Manual
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Android
Burritos
android/camera-sample/BurritoFragment
google/google-authenticator/BurritoActivity
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Android
Burritos
do
everything
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Android
Burritos
are
hard
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Android
Burritos
are
buggy
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Android
Burritos
are
legacy code
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Android
Burritos
are still
a thing today
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Android
Burritos
mislead new
programmers
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Android
Burritos
Simple things
that compose
really well
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Unix
Philosophy
Simple things
that compose
really well
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Music
Simple things
that compose
really well
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Simple things
that compose
really well
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Simple things that
compose really well
The magic of Music:
By combining those simple primitivies,
You can build all the music of the world
..like this symphony that 10.000 Japanese sing in German
https://www.youtube.com/watch?v=X6s6YKlTpfw
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RECAP
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RECAP
1. Real Mensch own their
mistakes
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RECAP
1. Real Mensch own their
mistakes
2. Mediocre documentation
makes beginners feel
stupid
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RECAP
1. Real Mensch own their
mistakes
2. Mediocre documentation
makes beginners feel
stupid
3. Simple things that compose
well
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Getting
in touch
dev.to/jmfayard
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