Function Composition: The top reason node.js
submissions get rejected by SoundCloud
Phil Calçado - SoundCloud@pcalcado
http://philcalcado.comFriday, May 11, 12
ohai!
i’m phil.
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i work here:
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Friday, May 11, 12
and we are hiring.
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http://bit.ly/work-at-soundcloud
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Phone
Code Review
Interviews
Offer
Friday, May 11, 12
Phone
Code Review
Interviews
Offer
Friday, May 11, 12
you can choose any language.
0
10
20
30
40
Ruby Java JavaScript (Node.js) C Clojure Scala
% of submissions on the past ~6 months
Friday, May 11, 12
you can choose any language.
0
10
20
30
40
Ruby Java JavaScript (Node.js) C Clojure Scala
rejected before interview invited for inverview
Friday, May 11, 12
you can choose any language.
0
10
20
30
40
Ruby Java JavaScript (Node.js) C Clojure Scala
rejected before interview invited for inverview
WTF?
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http://bit.ly/J1aLNn
we are all hipsters
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Not OO, not Functional...Just (bad) Procedural code.
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we don’t need this complicated stuff.this is not java, you know.
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http://bit.ly/JiFSnq
so what do we need?
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http://bit.ly/JFbZt8Friday, May 11, 12
http://bit.ly/JFbZt8
“SICP and some of the Sussman & Steele "Lambda the ..." papers made a big impression on me years before, although I did not understand their full meaning then.Remember, I was recruited to "do Scheme" [...] My interest in languages such as Self informed a subversive agenda [...]. Likewise with first-class functions, which were inspired by Scheme [...]”
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e.g. passing functions around
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we see a lot of this
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1st, we extract what is common
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then we refactor our functions
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and we send them as arguments
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e.g. closures not only for objects
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we see a lot of this
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we can keep writeComment as it is
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and we add a function with two closures
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and we add a function with two closures
immutable
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and we add a function with two closures
immutablemutable
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now we don’t need to pass in the kitchen sink
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e.g. functions all the way down
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we see a lot of this
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first we extract common protocol
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then we clean up our functions
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then we use them.
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then we use them. redundant?
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there is plenty to learn from.
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Qs?
Phil Calçado - SoundCloud@pcalcado
http://philcalcado.comFriday, May 11, 12
http://bit.ly/work-at-soundcloud
Friday, May 11, 12
How to Design Programs - http://bit.ly/K0BfrLStructure and Interpretation of Computer
Programs - http://bit.ly/K0BjYm
The Art of the Metaobject Protocol http://amzn.to/K0BqU1
Purely Functional Data Structures http://amzn.to/JFn4KG
Let Over Lambda - http://amzn.to/IMMkNO
An Introduction to Lambda Calculi for Computer Scientists - http://amzn.to/IX8d1B
All drawings are available as t-shirts from the awesome Diesel Sweeties - http://dieselsweeties.com/
Friday, May 11, 12
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