Berlin-Brandenburg Scala User Group: objects can still teach us one or two things.

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Phil Calçado

it’s not because you are not in object-land that you can drop minimally good practices

Technologie

objects can still teach us
one or two things.

Phil Calçado - SoundCloud
@pcalcado
http://philcalcado.com
Sunday, January 29, 12

http://bit.ly/work-at-soundcloud

Sunday, January 29, 12

(I will not talk about monads,
scalaz, bifunctors or burritos)

Sunday, January 29, 12

we thought we would...

Sunday, January 29, 12

we think we can...

Sunday, January 29, 12

but what I see in the wild...

Sunday, January 29, 12

coupling
no single responsibility
“cyclomatic complexity”

Sunday, January 29, 12

coupling
no single responsibility
“cyclomatic complexity”
it’s just (bad) procedural
code, really
Sunday, January 29, 12

that code was replaced by something like this

Sunday, January 29, 12

all old problems.

Sunday, January 29, 12

coupling
no single responsibility
“cyclomatic complexity”

composition!
Sunday, January 29, 12

building blocks you need:
higher-order functions
combinators
partial application
function composition

Sunday, January 29, 12

much older than we thought...

Sunday, January 29, 12

tl;dr
=> it’s not because you are not in object-
land that you can drop minimally good
practices
=> just using the basic blocks of functional
programming gives you a lot
=> after a while using these you see
patterns emerging. and you understand why
monads and friends exist. promise :)

Sunday, January 29, 12

Functional Programming with Bananas,
Lenses, Envelopes and Barbed Wire:
http://bit.ly/FP-with-Bananas-Lenses-
Envelopes-and-Barbed-Wire
Basic Category Theory for Computer
Scientists: http://amzn.to/xxeVUC
Theorems for free!:
http://bit.ly/Theorems-for-free
The Essence of Functional Programming:
http://bit.ly/the-essence-of-FP
Sunday, January 29, 12

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Presented at LeadingEng New York 2022 (https://leaddev.com/leadingeng-new-york/video/dont-try-home-how-practice-self-improvement-senior-leader) -- Most of us have developed our expertise as engineers through a mix of literature and experimentation. The software industry moves at a higher speed than others because we can try and study complex, real-world systems in the comfort of our bedrooms and personal Github accounts. When you become a leader, especially one who leads other leaders, things get a little more complicated. There are books, but they tend to contain generic advice. There are patterns, but the nature of the job makes it harder to identify when and how to apply them. In this session, I want to walk through a few things that have worked for me when you don't have a lab to try things out. Let's explore processes, tools, and resources to continuously improve your skills and expertise when there is no StackOverflow and no coding dojos. Phil Calçado is Global CTO at PicPay, the largest digital wallet in Latin America. He leads a team of more than 1,500 engineers building financial products for 60 million users and processing over four billion dollars yearly. Before PicPay, Phil was Senior Director of Engineering at SeatGeek, where he led the team that built the live events platform used by 44 million people worldwide. He also has led the platform team at Meetup/WeWork, worked on Linkerd - the pioneering Service Mesh, and headed product engineering for DigitalOcean and SoundCloud, both pioneers in the adoption of Microservices architectures.

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Berlin-Brandenburg Scala User Group: objects can still teach us one or two things.

1. objects can still teach us one or two things. Phil Calçado - SoundCloud @pcalcado http://philcalcado.com Sunday, January 29, 12

2. http://bit.ly/work-at-soundcloud Sunday, January 29, 12

3. (I will not talk about monads, scalaz, bifunctors or burritos) Sunday, January 29, 12

4. with Sunday, January 29, 12

5. we thought we would... Sunday, January 29, 12

6. more like... Sunday, January 29, 12

7. and then... Sunday, January 29, 12

8. Sunday, January 29, 12

9. with Sunday, January 29, 12

10. we think we can... Sunday, January 29, 12

11. but what I see in the wild... Sunday, January 29, 12

12. but what I see in the wild... Sunday, January 29, 12

13. coupling no single responsibility “cyclomatic complexity” Sunday, January 29, 12

14. coupling no single responsibility “cyclomatic complexity” it’s just (bad) procedural code, really Sunday, January 29, 12

15. that code was replaced by something like this Sunday, January 29, 12

16. coupling no single responsibility “cyclomatic complexity” Sunday, January 29, 12

17. all old problems. Sunday, January 29, 12

18. all old problems. ? Sunday, January 29, 12

19. coupling no single responsibility “cyclomatic complexity” composition! Sunday, January 29, 12

20. Sunday, January 29, 12

21. building blocks you need: higher-order functions combinators partial application function composition Sunday, January 29, 12

22. (I kinda lied) Sunday, January 29, 12

23. all old problems. ? Sunday, January 29, 12

24. much older than we thought... Sunday, January 29, 12

25. tl;dr => it’s not because you are not in object- land that you can drop minimally good practices => just using the basic blocks of functional programming gives you a lot => after a while using these you see patterns emerging. and you understand why monads and friends exist. promise :) Sunday, January 29, 12

26. Functional Programming with Bananas, Lenses, Envelopes and Barbed Wire: http://bit.ly/FP-with-Bananas-Lenses- Envelopes-and-Barbed-Wire Basic Category Theory for Computer Scientists: http://amzn.to/xxeVUC Theorems for free!: http://bit.ly/Theorems-for-free The Essence of Functional Programming: http://bit.ly/the-essence-of-FP Sunday, January 29, 12

Berlin-Brandenburg Scala User Group: objects can still teach us one or two things.

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Berlin-Brandenburg Scala User Group: objects can still teach us one or two things.