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Functional programming with ES6
This document discusses modeling government institutions and distribution of funds functionally in code using ES6 features. It suggests modeling the relationships between companies, populations, and governments as pure functions that take in data and return new values, rather than using an object-oriented approach. Functional programming in ES6 allows defining functions as immutable data and using map, filter and reduce to transform data in a pure and testable way.
Functional programming with ES6
- 1. Functional Programming with ES6 Guillaume Badi• 25.11.2015
- 2. Me ? Developer Evangelist@Mailjet Student @42 Node.JS fanboy Autodidact Twitter: @WeshGuillaume
- 3. This is the Government (l’état,c’est moi)
- 5.
- 6. When the money comesfrom the “Companies”, we have a set of rules describing the way it has to be distributed.
- 7. The hierarchical approach makes iteasy to visualize but hard to improve.
- 8. Problems Nobody fully understandsit It requires tons of people to maintain Adding new institutions is a pain Changing something in one area requires changes in many other areas
- 9.
- 10. We call itObject Oriented programming
- 11. This is astructured mess
- 12. We want afunction that takes the existing agents and returns new ones, when the money comes in.
- 13.
- 14. We could modelit differently. Companies1 Population1 Government1 Companies2 Population2 Government2
- 15. “It's not whoI am underneath, but what I do that defines me.” - The Batman
- 16. Object Oriented Programming is goodat describing things
- 17.
- 18.
- 19. And by extension… CAF= (salary, rent) => [Function] Pole Emploi = (workPeriod) => [Function] Institutions = (salary, rent, workPeriod) => [Function]
- 20. We want to“transform” our data, the mathematical way.
- 21. Functions should be pure.Understand “context-free”.
- 22. Functions are data thatoperate on some other data. It makes your code easy to test
- 23. Why is ES6good for the Job ?
- 24. Function syntax isnow short and clear
- 25. Returning functions ispure poetry
- 26.
- 27.
- 28.
- 29. A lot ofpeople just hate JavaScript
- 31. But precisely with thissyntax, We have the choice to adopt a Java coding style... Flatten a nested array
- 32.
- 33. Functional programming is notsimple. It requires discipline and… meditation
- 35. Immutable data isone of the keys
- 37.
- 38. If you haveto use the words “and” or “then”, to describe your function, split it.
- 39.
- 40. We could modelit differently. Companies1 Population1 Government1 Companies2 Population2 Government2
- 43.
Editor's Notes
- #10 la bureaucratie désigne un pouvoir sans direction qui se caractérise par des règles strictes, la division des responsabilités et une forte hiérarchie.
- #31 Parler de la syntax: const, let, fat arrow functions etc compared to es5
- #34 meditation: you might have to stare at your code (really long some times) to figure out how the data flows and once your function works, and pass the tests, bugs becomes rare
- #36 In OO, we call it states. But when your variables change, bugs are becoming hard to find and fix.
- #38 It ensures immutability
- #39 add example