Download - Why code in Node.js often get rejected by SoundCloud

Why code in Node.js often get rejected by

SoundCloud

Phil Calçado - SoundCloud@pcalcado

http://philcalcado.comTuesday, October 1, 13

http://gotocon.com/aarhus-2013/presentation/Why%20code%20in%20Node.js%20often%20get%20rejected%20by%20SoundCloud






http://philcalcado.com

http://philcalcado.com

2011: Phil zieht nach Berlin

Tuesday, October 1, 13

~ 200 million users / month

> 11 hours of audio uploaded every minute


http://bit.ly/15DToNK

hiring @ SoundCloud


http://bit.ly/J1aLNn


Phone

Code Review

Interviews

Offer


challenge until late 2012


you can choose any language.

0

10

20

30

40

Ruby Java JavaScript (Node.js) C Clojure Scala

% of submissions ~2011-2012



0

10

20

30

40

Ruby Java JavaScript (Node.js) C Clojure Scala

rejected before interview invited for inverview


new challenge



0

7.5

15

22.5

30

Ruby Java JavaScript (Node.js) Go Clojure Scala

% of submissions on the past ~1 year



0

7.5

15

22.5

30





0

7.5

15

22.5

30



WTF?



don’t get me wrong

we are all hipsters




Not OO, not Functional...Just (bad) Procedural code.


http://bit.ly/JiECRpTuesday, October 1, 13



we don’t need this complicated stuff.this is not java, you know.


http://bit.ly/JiFSnq

so how do we structure our app?




what to use?

(decent)procedures?


what to use?

objects?


what to use?

...functions?


http://bit.ly/JFbZt8Tuesday, October 1, 13




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 [...]”





http://bit.ly/JiEQYMTuesday, October 1, 13



http://bit.ly/JiF7ef

going old school




e.g. passing functions around


we see a lot of this


1st, we extract what is common


then we refactor our functions


and we send them as arguments


e.g. closures not only for objects


we can keep writeComment as it is


and we add a function with two closures



immutable



immutablemutable


now we don’t need to pass in the kitchen sink


e.g. functions all the way down


first we extract common protocol


then we clean up our functions


then we use them.


then we use them. redundant?


http://bit.ly/JiETndTuesday, October 1, 13



our “framework”:1 - Extract protocol in

“combinators”2 - Keep mutable state in

closures


no scary monads required


there is plenty to learn fromTuesday, October 1, 13

in the javascript community tooTuesday, October 1, 13

phil calçado

http://philcalcado.com@pcalcado

www.soundcloud.com


http://www.soundcloud.com

http://www.soundcloud.com

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/


http://bit.ly/K0BfrL












http://dieselsweeties.com/




Download - Why code in Node.js often get rejected by SoundCloud

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